EP4322636A1 - Procédé et dispositif de positionnement dans un système de communication sans fil - Google Patents

Procédé et dispositif de positionnement dans un système de communication sans fil Download PDF

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Publication number
EP4322636A1
EP4322636A1 EP22784967.6A EP22784967A EP4322636A1 EP 4322636 A1 EP4322636 A1 EP 4322636A1 EP 22784967 A EP22784967 A EP 22784967A EP 4322636 A1 EP4322636 A1 EP 4322636A1
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EP
European Patent Office
Prior art keywords
prs
information
measurement
location
positioning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP22784967.6A
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German (de)
English (en)
Inventor
Jeongsu Lee
Hyunsoo Ko
Haewook Park
Kijun Kim
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LG Electronics Inc
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LG Electronics Inc
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Publication of EP4322636A1 publication Critical patent/EP4322636A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
    • H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/0205—Details
    • G01S5/0236—Assistance data, e.g. base station almanac
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present disclosure relates to a method and device for positioning in a wireless communication system.
  • Mobile communication systems have been developed to guarantee user activity while providing voice services.
  • Mobile communication systems are expanding their services from voice only to data.
  • Current soaring data traffic is depleting resources and users' demand for higher-data rate services is leading to the need for more advanced mobile communication systems.
  • Next-generation mobile communication systems are required to meet, e.g., handling of explosively increasing data traffic, significant increase in per-user transmission rate, working with a great number of connecting devices, and support for very low end-to-end latency and high-energy efficiency.
  • various research efforts are underway for various technologies, such as dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.
  • MIMO massive multiple input multiple output
  • NOMA non-orthogonal multiple access
  • super wideband support and device networking.
  • the introduction of the reference station technique used in the existing satellite system to improve timing measurement may be considered.
  • a reference station is a technique used in satellite systems. In order to apply the reference station technique to an NR system composed of different entities from entities constituting the satellite system, a separate configuration or signaling procedure is required.
  • an object of the present disclosure is to provide a method of utilizing a reference UE to improve a result of positioning measurement.
  • a method of a user equipment (UE) for transmitting information for a measurement of a positioning reference signal (PRS) in a wireless communication system comprises receiving, from a location server, configuration information related to a positioning reference signal (PRS), receiving the PRS from a base station, and transmitting, to the location server, information for a measurement of the PRS.
  • UE user equipment
  • PRS positioning reference signal
  • the information for the measurement of the PRS includes information representing whether the UE is a reference UE.
  • Whether the UE is the reference UE may be determined based on condition information related to a determination of the reference UE.
  • the condition information related to the determination of the reference UE may include information for at least one of i) a maximum change amount of a received signal strength, ii) a maximum movement change amount, and/or iii) a specific time duration.
  • the specific time duration may be determined based on a reception time of the condition information related to the determination of the reference UE and a preset value.
  • the specific time duration may be determined based on a transmission time of the information for the measurement of the PRS and a previous transmission time of the information for the measurement of the PRS.
  • the specific time duration may be determined based on a reception time of a request message for the measurement of the PRS and a previous reception time of the request message for the measurement of the PRS.
  • the UE may be determined as the reference.
  • the UE may be determined as the reference UE.
  • the method may further comprise transmitting capability information representing whether the UE is able to operate as the reference UE.
  • the condition information related to the determination of the reference UE may be configured based on an RRC message, a medium access control-control element (MAC-CE), or an LTE Positioning Protocol (LPP) message.
  • RRC Radio Resource Control
  • MAC-CE medium access control-control element
  • LPP LTE Positioning Protocol
  • the information for the measurement of the PRS may further include additional information related to at least one of a timing error related to the base station, a propagation time related to the base station, and/or a timing error group (TEG) related to the base station.
  • a timing error related to the base station a timing error related to the base station
  • a propagation time related to the base station a propagation time related to the base station
  • TAG timing error group
  • a user equipment (UE) transmitting information for a measurement of a positioning reference signal (PRS) in a wireless communication system comprises one or more transceivers, one or more processors configured to control the one or more transceivers, and one or more memories operably connected to the one or more processors.
  • PRS positioning reference signal
  • the one or more memories are configured to store instructions performing operations based on being executed by the one or more processors.
  • the operations comprise receiving, from a location server, configuration information related to a positioning reference signal (PRS), receiving the PRS from a base station, and transmitting, to the location server, information for a measurement of the PRS.
  • PRS positioning reference signal
  • the information for the measurement of the PRS includes information representing whether the UE is a reference UE.
  • a device controlling a user equipment (UE) to transmit information for a measurement of a positioning reference signal (PRS) in a wireless communication system comprises one or more processors, and one or more memories operably connected to the one or more processors.
  • the one or more memories are configured to store instructions performing operations based on being executed by the one or more processors.
  • the operations comprise receiving, from a location server, configuration information related to a positioning reference signal (PRS), receiving the PRS from a base station, and transmitting, to the location server, information for a measurement of the PRS.
  • PRS positioning reference signal
  • the information for the measurement of the PRS includes information representing whether the UE is a reference UE.
  • one or more non-transitory computer readable mediums store one or more instructions.
  • the one or more instructions perform operations based on being executed by one or more processors.
  • the operations comprise receiving, from a location server, configuration information related to a positioning reference signal (PRS), receiving the PRS from a base station, and transmitting, to the location server, information for a measurement of the PRS.
  • PRS positioning reference signal
  • the information for the measurement of the PRS includes information representing whether a user equipment (UE) is a reference UE.
  • a method of a location server for receiving information for a measurement of a positioning reference signal (PRS) in a wireless communication system comprises transmitting, to a user equipment (UE), configuration information related to the PRS, the PRS being transmitted from a base station to the UE, and receiving, from the UE, information for a measurement of the PRS.
  • UE user equipment
  • the information for the measurement of the PRS includes information representing whether the UE is a reference UE.
  • a location server receiving information for a measurement of a positioning reference signal (PRS) in a wireless communication system comprises one or more transceivers, one or more processors configured to control the one or more transceivers, and one or more memories operably connected to the one or more processors.
  • PRS positioning reference signal
  • the one or more memories are configured to store instructions performing operations based on being executed by the one or more processors.
  • the operations comprise transmitting, to a user equipment (UE), configuration information related to the PRS, the PRS being transmitted from a base station to the UE, and receiving, from the UE, information for a measurement of the PRS.
  • UE user equipment
  • the information for the measurement of the PRS includes information representing whether the UE is a reference UE.
  • information for measurement of PRS includes information representing whether a UE is a reference UE. That is, a measurement report of the reference UE can be reported to be distinguished from a measurement report of a normal UE among measurement reports of multiple UEs transmitted to a location server. Since error value(s) for improvement of timing measurement can be determined based on the measurement report of the reference UE, accuracy of position measurement (e.g., multi-RTT) using the timing measurement can be improved.
  • error value(s) for improvement of timing measurement can be determined based on the measurement report of the reference UE, accuracy of position measurement (e.g., multi-RTT) using the timing measurement can be improved.
  • whether the UE is the reference UE is determined based on condition information related to determination of the reference UE.
  • condition information related to determination of the reference UE.
  • a measurement report of a specific UE satisfying a predefined condition e.g., a change amount of a received signal strength and/or a movement change amount
  • accuracy and precision for the measurement report of the reference UE can be guaranteed.
  • known structures or devices may be omitted or be shown in block diagrams while focusing on core features of each structure and device.
  • downlink means communication from a base station to a terminal
  • uplink means communication from the terminal to the base station.
  • a transmitter may be part of the base station, and a receiver may be part of the terminal.
  • the transmitter may be part of the terminal and the receiver may be part of the base station.
  • the base station may be expressed as a first communication device and the terminal may be expressed as a second communication device.
  • a base station may be replaced with terms including a fixed station, a Node B, an evolved-NodeB (eNB), a Next Generation NodeB (gNB), a base transceiver system (BTS), an access point (AP), a network (5G network), an AI system, a road side unit (RSU), a vehicle, a robot, an Unmanned Aerial Vehicle (UAV), an Augmented Reality (AR) device, a Virtual Reality (VR) device, and the like.
  • the terminal may be fixed or mobile and may be replaced with terms including a User Equipment (UE), a Mobile Station (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), a Wireless Terminal (WT), a Machine-Type Communication (MTC) device, a Machine-to-Machine (M2M) device, and a Device-to-Device (D2D) device, the vehicle, the robot, an AI module, the Unmanned Aerial Vehicle (UAV), the Augmented Reality (AR) device, the Virtual Reality (VR) device, and the like.
  • UAV Unmanned Aerial Vehicle
  • AR Augmented Reality
  • VR Virtual Reality
  • the following technology may be used in various wireless access systems, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier-FDMA (SC-FDMA), non-orthogonal multiple access (NOMA), and the like.
  • CDMA may be implemented by radio technology such as universal terrestrial radio access (UTRA) or CDMA2000.
  • UTRA universal terrestrial radio access
  • TDMA may be implemented by radio technology such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced data rates for GSM evolution (EDGE).
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • the OFDMA may be implemented as radio technology such as IEEE 802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA), and the like.
  • the UTRA is a part of a universal mobile telecommunication system (UMTS).
  • LTE-A evolution of 3GPP LTE.
  • LTE means technology after 3GPP TS 36.xxx Release 8.
  • LTE technology after 3GPP TS 36.xxx Release 10 is referred to as the LTE-A
  • LTE technology after 3GPP TS 36.xxx Release 13 is referred to as the LTE-A pro.
  • the 3GPP NR means technology after TS 38.xxx Release 15.
  • the LTE/NR may be referred to as a 3GPP system, "xxx" means a standard document detail number.
  • the LTE/NR may be collectively referred to as the 3GPP system. Matters disclosed in a standard document published before the present disclosure may refer to a background art, terms, abbreviations, etc., used for describing the present disclosure. For example, the following documents may be referenced.
  • next-generation radio access technology considering enhanced mobile broadband communication (eMBB), massive MTC (mMTC), ultra-reliable and low latency communication (URLLC) is discussed, and in the present disclosure, the technology is called NR for convenience.
  • eMBB enhanced mobile broadband communication
  • mMTC massive MTC
  • URLLC ultra-reliable and low latency communication
  • NR is an expression representing an example of 5G radio access technology
  • a New RAT system including NR uses an OFDM transmission scheme or a similar transmission scheme thereto.
  • the new RAT system may follow OFDM parameters different from OFDM parameters of LTE.
  • the new RAT system may follow numerology of conventional LTE/LTE-A as it is or have a larger system bandwidth (e.g., 100 MHz).
  • one cell may support a plurality of numerologies. In other words, UEs that operate with different numerologies may coexist in one cell.
  • the numerology corresponds to one subcarrier spacing in a frequency domain. By scaling a reference subcarrier spacing by an integer N, different numerologies may be defined.
  • eLTE eNB The eLTE eNB is the evolution of eNB that supports connectivity to EPC and NGC.
  • gNB A node which supports the NR as well as connectivity to NGC.
  • New RAN A radio access network which supports either NR or E-UTRA or interfaces with the NGC.
  • Network slice is a network defined by the operator customized to provide an optimized solution for a specific market scenario which demands specific requirements with end-to-end scope.
  • Network function is a logical node within a network infrastructure that has well-defined external interfaces and well-defined functional behavior.
  • NG-C A control plane interface used at an NG2 reference point between new RAN and NGC.
  • NG-U A user plane interface used at an NG3 reference point between new RAN and NGC.
  • Non-standalone NR A deployment configuration where the gNB requires an LTE eNB as an anchor for control plane connectivity to EPC, or requires an eLTE eNB as an anchor for control plane connectivity to NGC.
  • Non-standalone E-UTRA A deployment configuration where the eLTE eNB requires a gNB as an anchor for control plane connectivity to NGC.
  • User plane gateway An end point of NG-U interface.
  • FIG. 1 illustrates an example overall NR system structure to which a method as proposed in the disclosure may apply.
  • an NG-RAN is constituted of gNBs to provide a control plane (RRC) protocol end for user equipment (UE) and NG-RA user plane (new AS sublayer/PDCP/RLC/MAC/PHY).
  • RRC control plane
  • UE user equipment
  • NG-RA user plane new AS sublayer/PDCP/RLC/MAC/PHY
  • the gNBs are mutually connected via an Xn interface.
  • the gNBs are connected to the NGC via the NG interface.
  • the gNB connects to the access and mobility management function (AMF) via the N2 interface and connects to the user plane function (UPF) via the N3 interface.
  • AMF access and mobility management function
  • UPF user plane function
  • the numerology may be defined by the subcarrier spacing and cyclic prefix (CP) overhead.
  • CP cyclic prefix
  • multiple subcarrier spacings may be derived by scaling the basic subcarrier spacing by integer N (or, ⁇ ).
  • N integer
  • the numerology used may be selected independently from the frequency band.
  • various frame structures according to multiple numerologies may be supported.
  • OFDM orthogonal frequency division multiplexing
  • the multiple OFDM numerologies supported in the NR system may be defined as shown in Table 1.
  • NR supports multiple numerologies (or subcarrier spacings (SCS)) for supporting various 5G services. For example, if SCS is 15 kHz, NR supports a wide area in typical cellular bands. If SCS is 30 kHz/60 kHz, NR supports a dense urban, lower latency and a wider carrier bandwidth. If SCS is 60 kHz or higher, NR supports a bandwidth greater than 24.25 GHz in order to overcome phase noise.
  • numerologies or subcarrier spacings (SCS)
  • An NR frequency band is defined as a frequency range of two types FR1 and FR2.
  • the FR1 and the FR2 may be configured as in Table 1 below. Furthermore, the FR2 may mean a millimeter wave (mmW).
  • mmW millimeter wave
  • one set of frames for uplink and one set of frames for downlink may exist.
  • FIG. 2 illustrates a relationship between an uplink frame and downlink frame in a wireless communication system to which a method described in the present disclosure is applicable.
  • slots are numbered in ascending order of n s ⁇ ⁇ 0 , ... , N subframe slots , ⁇ ⁇ 1 in the subframe and in ascending order of n s , f ⁇ ⁇ 0 , ... , N frame slots , ⁇ ⁇ 1 in the radio frame.
  • One slot includes consecutive OFDM symbols of N symb ⁇ , and N symb ⁇ is determined according to the used numerology and slot configuration.
  • the start of slot n s ⁇ is temporally aligned with the start of n s ⁇ N symb ⁇ .
  • Not all UEs are able to transmit and receive at the same time, and this means that not all OFDM symbols in a downlink slot or an uplink slot are available to be used.
  • Table 3 represents the number N symb slot of OFDM symbols per slot, the number N slot frame , ⁇ of slots per radio frame, and the number N slot subframe , ⁇ of slots per subframe in a normal CP.
  • Table 4 represents the number of OFDM symbols per slot, the number of slots per radio frame, and the number of slots per subframe in an extended CP. [Table 3] ⁇ N symb slot N slot frame , ⁇ N slot subframe , ⁇ 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16 [Table 4] ⁇ N symb slot N slot frame , ⁇ N slot subframe , ⁇ 2 12 40 4
  • FIG. 3 illustrates an example of a frame structure in a NR system.
  • FIG. 3 is merely for convenience of explanation and does not limit the scope of the present disclosure.
  • a mini-slot may consist of 2, 4, or 7 symbols, or may consist of more symbols or less symbols.
  • an antenna port In regard to physical resources in the NR system, an antenna port, a resource grid, a resource element, a resource block, a carrier part, etc. May be considered.
  • the antenna port is defined so that a channel over which a symbol on an antenna port is conveyed may be inferred from a channel over which another symbol on the same antenna port is conveyed.
  • the two antenna ports may be regarded as being in a quasi co-located or quasi co-location (QC/QCL) relation.
  • the large-scale properties may include at least one of delay spread, Doppler spread, frequency shift, average received power, and received timing.
  • FIG. 4 illustrates an example of a resource grid supported in a wireless communication system to which a method proposed in the present disclosure is applicable.
  • a resource grid consists of N RB ⁇ N sc RB subcarriers on a frequency domain, each subframe consisting of 14 ⁇ 2 ⁇ OFDM symbols, but the present disclosure is not limited thereto.
  • a transmitted signal is described by one or more resource grids, consisting of N RB ⁇ N sc RB subcarriers, and 2 ⁇ N symb ⁇ OFDM symbols, where N RB ⁇ ⁇ N RB max , ⁇ ⁇ N RB max , ⁇ denotes a maximum transmission bandwidth and may change not only between numerologies but also between uplink and downlink.
  • one resource grid may be configured per numerology ⁇ and antenna port p.
  • FIG. 5 illustrates examples of a resource grid per antenna port and numerology to which a method proposed in the present disclosure is applicable.
  • the resource element ( k , l ) for the numerology ⁇ and the antenna port p corresponds to a complex value a k , l ⁇ p ⁇ .
  • the indexes p and ⁇ may be dropped, and as a result, the complex value may be a k , l ⁇ p or a k , l ⁇ .
  • Point A serves as a common reference point of a resource block grid and may be obtained as follows.
  • the common resource blocks are numbered from 0 and upwards in the frequency domain for subcarrier spacing configuration ⁇ .
  • n CRB ⁇ ⁇ k N sc RB ⁇
  • Physical resource blocks are defined within a bandwidth part (BWP) and are numbered from 0 to N BWP , i size ⁇ 1 , where i is No. Of the BWP.
  • BWP bandwidth part
  • n PRB in BWP i the common resource block
  • n CRB n PRB + N BWP , i start
  • N BWP , i start may be the common resource block where the BWP starts relative to the common resource block 0.
  • FIG. 6 illustrates physical channels and general signal transmission used in a 3GPP system.
  • the UE receives information from the eNB through Downlink (DL) and the UE transmits information from the eNB through Uplink (UL).
  • the information which the eNB and the UE transmit and receive includes data and various control information and there are various physical channels according to a type/use of the information which the eNB and the UE transmit and receive.
  • the UE When the UE is powered on or newly enters a cell, the UE performs an initial cell search operation such as synchronizing with the eNB (S601). To this end, the UE may receive a Primary Synchronization Signal (PSS) and a (Secondary Synchronization Signal (SSS) from the eNB and synchronize with the eNB and acquire information such as a cell ID or the like. Thereafter, the UE may receive a Physical Broadcast Channel (PBCH) from the eNB and acquire in-cell broadcast information. Meanwhile, the UE receives a Downlink Reference Signal (DL RS) in an initial cell search step to check a downlink channel status.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH Physical Broadcast Channel
  • DL RS Downlink Reference Signal
  • a UE that completes the initial cell search receives a Physical Downlink Control Channel (PDCCH) and a Physical Downlink Control Channel (PDSCH) according to information loaded on the PDCCH to acquire more specific system information (S602).
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Control Channel
  • the UE may perform a Random Access Procedure (RACH) to the eNB (S603 to S606).
  • RACH Random Access Procedure
  • the UE may transmit a specific sequence to a preamble through a Physical Random Access Channel (PRACH) (S603 and S605) and receive a response message (Random Access Response (RAR) message) for the preamble through the PDCCH and a corresponding PDSCH.
  • PRACH Physical Random Access Channel
  • RAR Random Access Response
  • a Contention Resolution Procedure may be additionally performed (S606).
  • the UE that performs the above procedure may then perform PDCCH/PDSCH reception (S607) and Physical Uplink Shared Channel (PUSCH)/Physical Uplink Control Channel (PUCCH) transmission (S608) as a general uplink/downlink signal transmission procedure.
  • the UE may receive Downlink Control Information (DCI) through the PDCCH.
  • DCI Downlink Control Information
  • the DCI may include control information such as resource allocation information for the UE and formats may be differently applied according to a use purpose.
  • control information which the UE transmits to the eNB through the uplink or the UE receives from the eNB may include a downlink/uplink ACK/NACK signal, a Channel Quality Indicator (CQI), a Precoding Matrix Index (PMI), a Rank Indicator (RI), and the like.
  • the UE may transmit the control information such as the CQI/PMI/RI, etc., through the PUSCH and/or PUCCH.
  • a BM procedure as layer 1 (L1)/layer 2 (L2) procedures for acquiring and maintaining a set of base station (e.g., gNB, TRP, etc.) and/or terminal (e.g., UE) beams which may be used for downlink (DL) and uplink (UL) transmission/reception may include the following procedures and terms.
  • the BM procedure may be divided into (1) a DL BM procedure using a synchronization signal (SS)/physical broadcast channel (PBCH) Block or CSI-RS and (2) a UL BM procedure using a sounding reference signal (SRS). Further, each BM procedure may include Tx beam sweeping for determining the Tx beam and Rx beam sweeping for determining the Rx beam.
  • SS synchronization signal
  • PBCH physical broadcast channel
  • SRS sounding reference signal
  • DL BM Downlink Beam Management
  • the DL BM procedure may include (1) transmission of beamformed DL reference signals (RSs) (e.g., CIS-RS or SS Block (SSB)) of the eNB and (2) beam reporting of the UE.
  • RSs beamformed DL reference signals
  • SSB SS Block
  • the beam reporting a preferred DL RS identifier (ID)(s) and L1-Reference Signal Received Power (RSRP).
  • ID preferred DL RS identifier
  • RSRP L1-Reference Signal Received Power
  • the DL RS ID may be an SSB Resource Indicator (SSBRI) or a CSI-RS Resource Indicator (CRI).
  • SSBRI SSB Resource Indicator
  • CRI CSI-RS Resource Indicator
  • the base station described in this disclosure may be a generic term for an object that transmits/receives data to and from UE.
  • the base station described herein may be a concept including one or more transmission points (TPs), one or more transmission and reception points (TRPs), and the like.
  • TPs transmission points
  • TRPs transmission and reception points
  • multiple TPs and/or multiple TRPs described herein may be included in one base station or included in multiple base stations.
  • the TP and/or TRP may include a panel of a base station, a transmission and reception unit, and the like.
  • the TRP described in this disclosure means an antenna array having one or more antenna elements available in a network located at a specific geographical location in a specific area.
  • TRP transmission point
  • the TRP may be replaced with a base station, a transmission point (TP), a cell (e.g., a macro cell/small cell/pico cell, etc.), an antenna array, or a panel and understood and applied as such.
  • Anchor carrier In NB-IoT, a carrier where the UE assumes that NPSS/NSSS/NPBCH/SIB-NB are transmitted.
  • Location Server a physical or logical entity (e.g., E-SMLC or SUPL SLP) that manages positioning for a target device by obtaining measurements and other location information from one or more positioning units and providing assistance data to positioning units to help determine this.
  • a Location Server may also compute or verify the final location estimate.
  • E-SMLC Evolved Serving Mobile Location Center
  • SLP SUPL Location Platform
  • SUPL Secure User Plane Location
  • NB-IoT NB-IoT allows access to network services via E-UTRA with a channel bandwidth limited to 200 kHz.
  • Reference Source a physical entity or part of a physical entity that provides signals (e.g., RF, acoustic, infrared) that can be measured (e.g., by a Target Device) in order to obtain the location of a Target Device.
  • Target Device the device that is being positioned (e.g., UE or SUPL SET).
  • Transmission Point (TP) A set of geographically co-located transmit antennas for one cell, part of one cell or one PRS-only TP.
  • Transmission Points can include base station (ng-eNB or gNB) antennas, remote radio heads, a remote antenna of a base station, an antenna of a PRS-only TP, etc.
  • One cell can be formed by one or multiple transmission points. For a homogeneous deployment, each transmission point may correspond to one cell.
  • Observed Time Difference Of Arrival (OTDOA) The time interval that is observed by a target device between the reception of downlink signals from two different TPs. If a signal from TP 1 is received at the moment t 1 , and a signal from TP 2 is received at the moment t 2 , the OTDOA is t 2 - t 1 .
  • PRS-only TP A TP which only transmits PRS signals for PRS-based TBS positioning and is not associated with a cell.
  • the expectedRSTD field takes into account the expected propagation time difference as well as transmit time difference between the two cells.
  • the RSTD value can be negative and is calculated as (expectedRSTD-8192).
  • expectedRSTD-Uncertainty (from 36.355): 1) If PRS is transmitted: This field indicates the uncertainty in expectedRSTD value. The uncertainty is related to the location server's a-priori estimation of the target device location.
  • the expectedRSTD and expectedRSTD-Uncertainty together define the search window for the target device.
  • NOTE PRS occasion group periodicity
  • This field indicates the uncertainty in expectedRSTD value.
  • the uncertainty is related to the location server's a-priori estimation of the target device location.
  • the expectedRSTD and expectedRSTD-Uncertainty together define the search window for the target device.
  • the target device may assume that the beginning of the closest subframe of this neighbour cell to subframe X is received within the search window of size [- expectedRSTD-Uncertainty ⁇ 3 ⁇ T s , expectedRSTD-Uncertainty ⁇ 3 ⁇ T s ] centered at T x + ( expectedRSTD- 8192) ⁇ 3 ⁇ T s ,
  • Positioning may mean determining the geographic location and / or speed of the UE by measuring a radio signal.
  • the location information may be requested by a client (e.g. an application) related to the UE and reported to the client.
  • the location information may be included in a core network or may be requested by a client connected to the core network.
  • the location information may be reported in a standard format such as cell-based or geographic coordinates, and in this case, the estimation error values for the location(position) and speed of the UE and/or the positioning measurement method used for positioning may be reported together.
  • FIG. 7 is a diagram illustrating an example of a positioning protocol configuration for measuring a location of a user equipment (UE).
  • UE user equipment
  • LPP may be used as a point-to-point between a location server (E-SMLC and/or SLP and/or LMF) and a target device to position the target device (UE and/or SET) based on position-related measurements obtained from one or more reference sources.
  • the target device and the location server may exchange measurement and/or location information based on signal A and/or signal B through the LPP.
  • NRPPa may be used to exchange information between the reference source (ACCESS NODE and/or BS and/or TP and/or NG-RAN nodes) and the location server.
  • the reference source ACCESS NODE and/or BS and/or TP and/or NG-RAN nodes
  • Functions provided by the NRPPa protocol may include the following.
  • a positioning reference signal For positioning, a positioning reference signal (PRS) may be used.
  • the PRS is a reference signal used for position estimation of the UE.
  • PRS mapping in a wireless communication system to which embodiments are applicable in the present disclosure may be performed based on Table 6 below.
  • the PRS reception procedure of the UE in a wireless communication system to which embodiments are applicable in the present disclosure may be performed based on Table 7 below.
  • Table 7 5.1.6.5 PRS reception procedure
  • the UE can be configured with one or more DL PRS resource set configuration(s) as indicated by the higher layer parameters DL-PRS-ResourceSet and DL-PRS-Resource.
  • Each DL PRS resource set consists of K ⁇ 1 DL PRS resource(s) where each has an associated spatial transmission filter.
  • the UE can be configured with one or more DL PRS Positioning Frequency Layer configuration(s) as indicated by the higher layer parameter DL-PRS-PositioningFrequencyLayer.
  • a DL PRS positioning Frequency Layer id defined as a collection of DL PRS Resource Sets which have common parameters configured by DL-PRS-PositioningFrequencyLayer. The UE assumes that the following parameters for each DL PRS resource(s) are configured via higher layer parameters DL-PRS-positioningFrequencyLayer, DL-PRSResoureceSet and DL-PRS-Resource.
  • a positioning frequency layer consists of one or more PRS resource sets and it is defined by: - DL-PRS-SubcarrierSpacing defines the subcarrier spacing for the DL PRS resurce.
  • All DL PRS Resoiurces and DL PRS Resource sets in the same DL-PRS-PositioningFrequencyLayer have the same value of DL-PRS-SubcarrierSpacing.
  • the supported values of DL-PRS-SubcarrierSpacing are given in Table 4.2-1 of [4, TS38.211].
  • - DL-PRS-CyclicPrefix defines the cyclic prefix for the DL PRS resource. All DL PRS Resources and DL PRS Resiurce stes in the same DL-PRS-PositioningFrequencyLayer have the same value of DL-PRS-CyclicPrefix.
  • DL-PRS-CyclicPrefix The supportes values of DL-PRS-CyclicPrefix are given in Table 4.2-1 of [4, TS38.211].
  • - DL-PRS-Point A defines the absolue frequency o the reference resource block. Its lowest subcarrier is also known as Point A. All DL PRS resources belonging to the same DL PRS Resource Set have common Point A and all DL PRS Resources sets belonging to the same DL-PRS-PositioningFrequencyLayer have a common Point A.
  • the UE expects that it will be configured with [IDs] each of which is defined such that it is assocaited with multiple DL PRS Resource Sets from the same cell.
  • a PRS resource set consists of one or more PRS resources ans it is defined by: - DL-PRS-ResourceSetld defines the identify of the DL PRS resource set configuration.
  • - DL-PRSResourceRepetitionFactor defines how many times each DL-PRS resource is repeated for a single instance of the DL-PRS resource set and takes values T rep PRS ⁇ 1 2 4 6,8 16 32 ,. All the DL PRS resources within one resource set have the same ResourceRepetitionFactor -DM-PRS-ResourceTimeGap defines the offset in number of slots between two repeated instances of a DL PRS resource with the same DL-PRS-ResourceID within a single instance of the DL PRS resource set and takes value T gap PRS ⁇ 1 2 4,8 16 32 .
  • the UE only expects to be configured with DL-PRS-ResourceTimeGap if DL-PRS-ResourceRepetitionFactor is configured with value greater than 1.
  • the time duration spanned by one instance of a DL-PRS-ResourceSet is not expected to exceed the configured value of DL-PRS-Periodicity.
  • All the DL PRS resources within one resource set have the same DL-PRS-ResourceTimeGap - DL-PRS-MutingPattern defines a bitmap of the time locations where the DL PRS resource is expected to not be transmitted for a DM PRS resource set.
  • the bitmap size can be ⁇ 2, 4, 8, 16, 32 ⁇ bits long.
  • the bitmap has two options for applicability.
  • each bit in the bitmap corresponds to a configurable number of consecutive instances of a DL-PRS-ResourceSet where all the DL-PRS-Resources within the set are muted for the instance that is indicated to be muted.
  • each bit in the bitmap corresponds to a single repetition index for each of the DL-PRS-Resources within each instance of a DL-PRS-ResourceSet and the length of the bitmap is equal to DL-PRS-ResourceRepetitionFactor. Both options may be configured at the same time in which case the logical AND operation is applied to the bit maps as described in clause 7.4.1.7.4 of [4, TS 38.211].
  • - DL-PRS-SFN0-Offset defines the time offset of the SFNO slot 0 for the transmitting cell with respect to SFNO slot 0 of [FFS in RAN2].
  • - DL-PRS-ResourceSetSlotOffset defines the slot offset with respect to SFNO slot 0 and takes values T offset PRS ⁇ 0,1 , ... , T per PRS ⁇ 1 .
  • - DL-PRS-CombSizeN defines the comb size of a DL PRS resource where the allowable values are given in Clause 7.4.1.7.1 of [TS38.211]. All DL PRS resource sets belonging to the same positioning frequency layer have the same value of DL-PRS-combSizeN.
  • - DL-PRS-ResourceBandwidth defines the number of resource blocks configured for PRS transmission.
  • the parameter has a granularity of 4 PRBs with a minimum of 24 PRBs and a maximum of 272 PRBs.
  • All DL PRS resources sets within a positioning frequency layer have the same value of DL-PRS-ResourceBandwidth.
  • a PRS resource is defined by: - DL-PRS-ResourceList determines the DL PRS resources that are contained within one DL PRS resource set.
  • - DL-PRS-Resourceld determines the DL PRS resource configuration identity. All DL PRS resource IDs are locally defined within a DL PRS resource set.
  • - DL-PRS-Sequenceld is used to initialize cinit value used in pseudo random generator [4, TS38.211, 7.4.1.7.2] for generation of DL PRS sequence for a given DL PRS resource.
  • - DL-PRS-ReOffset defines the starting RE offset of the first symbol within a DL PRS resource in frequency.
  • the relative RE offsets of the remaining symbols within a DL PRS resource are defined based on the initial offset and the rule described in Clause 7.4.1.7.3 of [4, TS38.211].
  • - DL-PRS-ResourceSlotOffset determines the starting slot of the DL PRS resource with respect to corresponding DL-PRS-ResourceSetSlotOffset
  • - DL-PRS-ResourceSymbolOffset determines the starting symbol of the DL PRS resource within the starting slot.
  • - DL-PRS-NumSymbols defines the number of symbols of the DL PRS resource within a slot where the allowable values are given in Clause 7.4.1.7.1 of [4, TS38.211].
  • - DL-PRS-QCL-Info defines any quasi-colocation information of the DL PRS resource with other reference signals.
  • the DL PRS may be configured to be 'QCL-Type-D' with a DL PRS or SS/PBCH Block from a serving cell or a non-serving cell.
  • the DL PRS may be configured to be 'QCL-Type-C' with a SS/PBCH Block from a serving or non-serving cell. If the DL PRS is configured as both 'QCL-Type-C' and 'QCL-Type-D' with a SS/PBCH Block then the SSB index indicated should be the same.
  • - DL-PRS-StartPRB defines the starting PRB index of the DL PRS resource with respect to reference Point A.
  • the starting PRB index has a granularity of one PRB with a minimum value of 0 and a maximum value of 2176 PRBs. All DL PRS Resource Sets belonging to the same Positioning Frequency Layer have the same value of Start PRB.
  • the UE assumes constant EPRE is used for all REs of a given DL PRS resource.
  • the UE may be indicated by the network that a DL PRS resources can be used as the reference for the RSTD measurement in a higher layer parameter DL-PRS-RstdReferenceInfo.
  • the reference time indicated by the network to the UE can also be used by the UE to determine how to apply higher layer parameters DL-PRS-expectedRSTD and DL-PRS-expectedRSTD-uncertainty.
  • the UE expects the reference time to be indicated whenever it is expected to receive the DL PRS.
  • This reference time provided by DL-PRS-RstdReferenceInfo may include an [ID], a PRS resource set ID, and optionally a single PRS resource ID or a list of PRS resource IDs.
  • the UE may use different DL PRS resources or a different DL PRS resource set to determine the reference time for the RSTD measurement as long as the condition that the DL PRS resources used belong to a single DL PRS resource set is met. If the UE chooses to use a different reference time than indicated by the network, then it is expected to report the DL PRS resource ID(s) or the DL PRS resource set ID used to determine the reference.
  • the UE may be configured to report quality metrics corresponding to the RSTD and UE Rx-Tx time difference measurements which include the following fields: - TimingMeasQuality-Value which provides the best estimate of the uncertainty of the measurement - TimingMeasQuality-Resolution which specifies the resolution levels used in the Value field
  • the UE expects to be configured with higher layer parameter DL-PRS-expectedRSTD, which defines the time difference with respect to the received DL subframe timing the UE is expected to receive DL PRS, and DL-PRS-expectedRSTD-uncertainty, which defines a search window around the expected RSTD.
  • the UE can be configured to report the DL PRS resource ID(s) or the DL PRS resource set ID(s) associated with the DL PRS resource(s) or the DL PRS resource set(s) which are used in determining the UE measurements DL RSTD, UE Tx-Rx time difference or the DL PRS-RSRP.
  • the UE can be configured in higher layer parameter UE Rx-Tx Time-MeasRequestlnfo to report multiple UE Rx-Tx time difference measurements corresponding to a single configured SRS resource or resource set for positioning. Each measurement corresponds to a single received DL PRS resource or resource set which can be in difference positioning frequency layers.
  • UE Rx-Tx Time difference measurements the UE can report an associated higher layer parameter Timestamp.
  • the Timestamp can include the SFN and the slot number for a subcarrier spacing. These values correspond to the reference which is provided by DL-PRS-RSTDReferencelnfo.
  • the UE is expected to measure the DL PRS resource outside the active DL BWP or with a numerology different from the numerology of the active DL BWP if the measurement is made during a configured measurement gap.
  • the UE is only required to measure DL PRS within the active DL BWP and with the same numerology as the active DL BWP.
  • the UE is not provided with a measurement gap, the UE is not expected to process DL PRS resources on serving or non-serving cells on any symbols indicated as UL by the serving cell.
  • the UE is expected to measure the DL PRS resource outside the active DL BWP it may request a measurement gap in higher layer parameter [XYZ].
  • the UE assumes that for the serving cell the DL PRS is not mapped to any symbol that contains SS/PBCH. If the time frequency location of the SS/PBCH block transmissions from non-serving cells are provided to the UE then the UE also assumes that the DL PRS is not mapped to any symbol that contains the SS/PBCH block of the non-serving cell.
  • the UE may be configured to report, subject to UE capability, up to 4 DL RSTD measurements per pair of cells with each measurement between a different pair of DL PRS resources or DL PRS resource sets within the DL PRS configured for those cells. The up to 4 measurements being performed on the same pair of cells and all DL RSTD measurements in the same report use a single reference timing.
  • the UE may be configured to measure and report up to 8 DL PRS RSRP measurements on different DL PRS resources from the same cell.
  • the UE may indicate which DL PRS RSRP measurements have been performed using the same spatial domain filter for reception. If the UE is configured with DL-PRS-QCL-Info and the QCL relation is between two DL PRS resources, then the UE assumes those DL PRS resources are from the same cell.
  • DL-PRS-QCL-Info is configured to the UE with 'QCL-Type-D' with a source DL-PRS-Resource then the DL-PRS-ResourceSetld and the DL-PRS-Resourceld of the source DL-PRS-Resource are expected to be indicated to the UE.
  • the UE does not expect to process the DL PRS in the same symbol where other DL signals and channels are transmitted to the UE when there is no measurement gap configured to the UE.
  • FIG. 8 is a diagram illustrating an example of architecture of a system for measuring a location of an UE.
  • the AMF may receive a request for location service related to a specific target UE from another entity such as the GMLC (Gateway Mobile Location Center), or may decide to start the location service on behalf of the specific target UE in the AMF itself. Then, the AMF transmits a location service request to the LMF (Location Management Function).
  • the LMF receiving the location service request may process the location service request and return a processing result including the estimated location of the UE to the AMF.
  • the AMF may transmit the processing result received from the LMF to another entity.
  • New generation evolved-NB (ng-eNB) and gNB may be network elements of NG-RAN that can provide measurement results for location tracking, and measure a radio signal for the target UE and transmit the result to the LMF.
  • the ng-eNB may control some TPs (Transmission Points), such as remote radio heads, or PRS-only TPs supporting a PRS-based beacon system for E-UTRA.
  • TPs Transmission Points
  • the LMF may be connected to an Enhanced Serving Mobile Location Center (E-SMLC), and the E-SMLC may enable the LMF to access the E-UTRAN.
  • E-SMLC may enable the LMF to support Observed Time Difference Of Arrival (OTDOA) which is one of the E-UTRAN positioning measurement methods, based on the downlink measurement which is obtained by the target UE through a signal transmitted from TPs dedicated for PRS in the eNB and/or E-UTRAN.
  • OTDOA Observed Time Difference Of Arrival
  • the LMF may be connected to a SUPL Location Platform (SLP).
  • the LMF may support and manage different location services for target UEs.
  • the LMF may interact with the serving ng-eNB or serving gNB for the target UE to obtain the location measurement of the UE.
  • the LMF may determine a positioning measurement method based on Location Service (LCS) client type, required QoS (Quality of Service), UE positioning capabilities, and gNB positioning capabilities and ng-eNB positioning capabilities, and apply this positioning measurement method to the serving gNB and/or the serving ng-eNB.
  • the LMF may determine a position estimate for the target UE and additional information such as accuracy of the position estimate and velocity.
  • the SLP is a SUPL (Secure User Plane Location) entity responsible for positioning through a user plane.
  • the UE may measure the location of the UE by utilizing a downlink reference signal transmitted from the NG-RAN and the E-UTRAN.
  • the downlink reference signal transmitted from the NG-RAN and the E-UTRAN to the UE may include an SS/PBCH block, CSI-RS and/or PRS, etc., and whether to measure the location of the UE using any downlink reference signal may depend on a configuration such as LMF/E-SMLC/ng-eNB/E-UTRAN, etc.
  • the location of the UE may be measured in a RAT-independent method using different GNSS (Global Navigation Satellite System), TBS (Terrestrial Beacon System), WLAN access points, Bluetooth beacon and a sensor (e.g.
  • GNSS Global Navigation Satellite System
  • TBS Transmissionrestrial Beacon System
  • WLAN access points e.g.
  • the UE may include an LCS application, and access the LCS application through communication with a network to which the UE is connected or other applications included in the UE.
  • the LCS application may include measurement and calculation functions necessary to determine the location of the UE.
  • the UE may include an independent positioning function such as Global Positioning System (GPS), and may report the location of the UE independently of NG-RAN transmission.
  • GPS Global Positioning System
  • the independently acquired positioning information may be utilized as auxiliary information of positioning information acquired from the network.
  • FIG. 9 is a diagram illustrating an example of a procedure for measuring a location of a UE.
  • CM-IDLE Connection Management - IDLE
  • the AMF may establish a signaling connection with the UE, and request a network trigger service to allocate a specific serving gNB or ng-eNB.
  • This operation process is omitted in FIG. 9 . That is, in FIG. 8 , it may be assumed that the UE is in a connected mode. However, the signaling connection may be released during the positioning process by the NG-RAN for reasons such as signaling and data inactivity.
  • a 5GC entity such as GMLC may request a location service for measuring the location of a target UE with a serving AMF.
  • the serving AMF may determine that the location service is necessary for measuring the location of the target UE. For example, in order to measure the location of the UE for an emergency call, the serving AMF may decide to directly perform the location service.
  • the AMF may send a location service request to the LMF, and based on step 3a, the LMF may initiate location procedures for obtaining location measurement data or location measurement assistance data together with the serving ng-eNB and the serving gNB.
  • the LMF may request location-related information related to one or more UEs to the NG-RAN, and instruct the type of location information required and the associated QoS.
  • the NG-RAN may transmit the location-related information to the LMF.
  • the NG-RAN may transmit additional location-related information to the LMF through one or more NRPPa messages.
  • 'location-related information' may mean all values used for location calculation, such as actual location estimation information and wireless measurement or location measurement, etc.
  • the protocol used in step 3a may be an NRPPa protocol, which will be described later.
  • the LMF may initiate location procedures for downlink positioning with the UE.
  • the LMF may send location assistance data to the UE, or obtain a location estimate or location measurement.
  • a capability transfer process may be performed.
  • the LMF may request capability information from the UE, and the UE may transmit capability information to the LMF.
  • the capability information may include information on a location measurement method that the LFM or UE can support, information on various aspects of a specific location measurement method, such as various types of assistance data for A-GNSS, and information on common characteristics that are not limited to any one location measurement method, such as the ability to handle multiple LPP transactions, etc.
  • the UE may provide capability information to the LMF.
  • a location assistance data transfer process may be performed in step 3b.
  • the UE may request location assistance data from the LMF, and may indicate required specific location assistance data to the LMF.
  • the LMF may deliver location assistance data corresponding thereto to the UE, and additionally, may transmit additional assistance data to the UE through one or more additional LPP messages.
  • location assistance data transmitted from the LMF to the UE may be transmitted through a unicast method, and in some cases, the LMF may transmit location assistance data and/or additional assistance data to the UE without the UE requesting assistance data from the LMF.
  • a location information transfer process may be performed in step 3b.
  • the LMF may request the UE for location-related information related to the UE, and may indicate the type of location information required and the associated QoS. Then, in response to the request, the UE may transmit the location related information to the LMF. In this case, the UE may additionally transmit additional location-related information to the LMF through one or more LPP messages.
  • 'location-related information' may mean all values used for location calculation, such as actual location estimation information and wireless measurement or location measurement, etc, and representatively, there may be a Reference Signal Time Difference (RSTD) value measured by the UE based on downlink reference signals transmitted from a plurality of NG-RAN and/or E-UTRAN to the UE. Similar to the above, the UE may transmit the location-related information to the LMF even if there is no request from the LMF.
  • RSTD Reference Signal Time Difference
  • step 3b is performed in the order of a capability transfer process, an assistance data transfer process, and a location information transfer process, but is not limited to this order.
  • step 3b is not limited to a specific order in order to improve the flexibility of location measurement.
  • the UE may request location assistance data at any time to perform the location measurement request already requested by the LMF.
  • the LMF may also request location information, such as location measurements or location estimates, at any time.
  • the UE may transmit capability information to the LMF at any time.
  • an Error message may be transmitted/received, and an Abort message may be transmitted/received for stopping position measurement.
  • the protocol used in step 3b may be an LPP protocol, which will be described later.
  • step 3b may be additionally performed after step 3a is performed, or may be performed instead of step 3a.
  • the LMF may provide a location service response to the AMF.
  • the location service response may include information on whether the location estimation of the UE was successful and the location estimate of the UE.
  • the AMF may deliver a location service response to a 5GC entity such as GMLC, and if the procedure of FIG. 9 is initiated by step 1b, the AMF may use a location service response to provide a location service related to an emergency call or the like.
  • -NR-Uu interface The NR-Uu interface, connecting the UE to the gNB over the air, is used as one of several transport links for the LTE Positioning Protocol for a target UE with NR access to NG-RAN.
  • - LTE-Uu interface The LTE-Uu interface, connecting the UE to the ng-eNB over the air, is used as one of several transport links for the LTE Positioning Protocol for a target UE with LTE access to NG-RAN.
  • the NG-C interface between the gNB and the AMF and between the ng-eNB and the AMF is transparent to all UE-positioning-related procedures. It is involved in these procedures only as a transport link for the LTE Positioning Protocol.
  • the NG-C interface transparently transports both positioning requests from the LMF to the gNB and positioning results from the gNB to the LMF.
  • the NG-C interface transparently transports both positioning requests from the LMF to the ng-eNB and positioning results from the ng-eNB to the LMF.
  • the NLs interface between the LMF and the AMF, is transparent to all UE related, gNB related and ng-eNB related positioning procedures. It is used only as a transport link for the LTE Positioning Protocols LPP and NRPPa.
  • LTP LTE Positioning Protocol
  • FIG. 10 is a diagram illustrating an example of a protocol layer for supporting LPP message transmission.
  • an LPP PDU may be transmitted through a NAS PDU between the MAF and the UE.
  • the LPP may terminate a connection between a target device (e.g. UE in the control plane or SUPL Enabled Terminal (SET) in the user plane) and a location server (e.g. LMF in the control plane or SLP in the user plane).
  • the LPP message may be delivered in the form of a transparent PDU through an intermediate network interface using an appropriate protocol such as NGAP through the NG-C interface, NAS/RRC through the LTE-Uu and NR-Uu interfaces.
  • the LPP protocol enables positioning for NR and LTE based on various positioning methods.
  • the target device and the location server may exchange capability information, assistance data for positioning, and/or location information with each other through the LPP protocol.
  • error information exchange and/or an instruction to stop the LPP procedure may be performed through the LPP message.
  • a signal transmission/reception operation based on the LPP protocol to which the method proposed in the present disclosure can be applied may be performed based on Table 9 below.
  • Table 9 As described above, the protocol operates between a "target" and a "server". In the control-plane context, these entities are the UE and LMF respectively; in the SUPL context they are the SET and the SLP. A procedure may be initiated by either the target or the server.
  • Capability Transfer Capabilities in an LPP context refer to the ability of a target or server to support different position methods defined for LPP, different aspects of a particular position method (e.g. different types of assistance data for A-GNSS) and common features not specific to only one position method (e.g. ability to handle multiple LPP transactions).
  • LPP Capability Transfer procedure 1 The server may send a request for the LPP related capabilities of the target. 2. The target transfers its LPP-related capabilities to the server. The capabilities may refer to particular position methods or may be common to multiple position methods. LPP Capability Indication procedure is used for unsolicited capability transfer. 2) Assistance data Transfer Assistance data may be transferred either by request or unsolicited.
  • assistance data delivery is supported only via unicast transport from server to target.
  • Example of LPP Assistance Data Transfer procedure 1.
  • the target may send a request to the server for assistance data and may indicate the particular assistance data needed.
  • the server transfers assistance data to the target.
  • the transferred assistance data should match any assistance data requested in step 1.
  • the server may transfer additional assistance data to the target in one or more additional LPP messages.
  • LPP Assistance Data Delivery procedure is used for unilateral assistance data transfer. This procedure is unidirectional; assistance data are always delivered from the server to the target.
  • Location Information Transfer The term "location information" applies both to an actual position estimate and to values used in computing position (e.g., radio measurements or positioning measurements). It is delivered either in response to a request or unsolicited.
  • Example of LPP Location Information Transfer procedure 1 The server may send a request for location information to the target, and may indicate the type of location information needed and associated QoS. 2. In response to step 1, the target transfers location information to the server. The location information transferred should match the location information requested in step 1. 3. Optionally (e.g., if requested in step 1), the target in step 2 may transfer additional location information to the server in one or more additional LPP messages.
  • LPP Location Information Delivery procedure is used for unilateral location information transfer. Furthermore, the LPP Location Information Delivery procedure can only be piggybacked in the MO-LR request. 4) Multiple Transactions Multiple LPP transactions may be in progress simultaneously between the same target and server nodes, to improve flexibility and efficiency.
  • no more than one LPP procedure between a particular pair of target and server nodes to obtain location information shall be in progress at any time for the same position method.
  • the objective is to request location measurements from the target, and the server does not provide assistance data in advance, leaving the target to request any needed assistance data.
  • Example of multiple LPP procedures 1.
  • the server sends a request to the target for positioning measurements. 2.
  • the target sends a request for particular assistance data. 3.
  • the server returns the assistance data requested in step 2.
  • the target obtains and returns the location information (e.g., positioning method measurements) requested in step 1. 5) Error handling
  • the procedure is used to notify the sending endpoint by the receiving endpoint that the receiving LPP message is erroneous or unexpected.
  • This procedure is bidirectional at the LPP level; either the target or the server may take the role of either endpoint in the corresponding procedure.
  • Example of Error handling procedure 1. The target or server sends a LPP message to the other endpoint (i.e, "Server/Target"). 2. If the server or target ("Server/Target") detects that the receiving LPP message is erroneous or unexpected, the server or target transfers error indication information to the other endpoint ("Target/Server"). 6) Abort The procedure is used to notify the other endpoint by one endpoint to abort an ongoing procedure between the two endpoints. This procedure is bidirectional at the LPP level; either the target or the server may take the role of either endpoint in the corresponding procedure.
  • Example of Abort procedure A LPP procedure is ongoing between target and server. 2. If the server or target (“Server/Target”) determines that the procedure must be aborted, and then the server or target sends an LPP Abort message to the other endpoint ("Target/Server”) carrying the transaction ID for the procedure.
  • server/Target the server or target
  • NRPPa NR Positioning Protocol A
  • FIG. 11 is a diagram illustrating an example of a protocol layer for supporting NRPPa transmission. Specifically, FIG. 11 illustrates a protocol layer for supporting transmission of an NRPPa PDU (NR Positioning Protocol a Protocol Data Unit).
  • NRPPa PDU NR Positioning Protocol a Protocol Data Unit
  • the NRPPa may be used for information exchange between the NG-RAN node and the LMF. Specifically, the NRPPa may used to exchange E-CID for measurement transmitted from ng-eNB to LMF, data for supporting the OTDOA positioning method, Cell-ID and Cell location ID for the NR Cell ID positioning method, and the like.
  • the AMF may route NRPPa PDUs based on the routing ID of the associated LMF through the NG-C interface even if there is no information on the associated NRPPa transaction.
  • the procedure of the NRPPa protocol for location and data collection can be divided into two types.
  • the first type is a UE associated procedure for delivering information on a specific UE (e.g. location measurement information, etc.)
  • the second type is a non-UE associated procedure for delivering information applicable to an NG-RAN node and related TPs (e.g. gNB/ng-eNG/TP timing information, etc.).
  • the two types of procedures may be supported independently or at the same time.
  • a signal transmission/reception operation based on the NRPPa protocol to which the embodiments proposed in the present disclosure can be applied may be performed based on Table 10 below.
  • Table 10 Positioning and data acquisition transactions between a LMF and NG-RAN node are modelled by using procedures of the NRPPa protocol.
  • NRPPa procedures There are two types of NRPPa procedures: - UE associated procedure, i.e. transfer of information for a particular UE (e.g. positioning measurements); - Non UE associated procedure, i.e. transfer of information applicable to the NG-RAN node and associated TPs (e.g. gNB/ng-eNB/TP timing information).
  • Parallel transactions between the same LMF and NG-RAN node are supported; i.e.
  • a pair of LMF and NG-RAN node may have more than one instance of an NRPPa procedure in execution at the same time.
  • the protocol is consedered to operate between a generic "access node” (e.g. ng-eNB) and a "server” (e.g. LMF).
  • a procedure is only initiated by the server.
  • Example of a single NRPPa transaction 1. Access Node sends NRPPa Procedure Request to Server. 2. Server sends NRPPa Procedure Response to Access Node. N. Access Node sends NRPPa Procedure Response (end transaction) to server. (this step may be omitted).
  • the exmaple shows a single NRPPa transaction.
  • the transaction is terminated in step 2 in the case of a non UE associated procedure.
  • additional responses may be allowed (e.g. sending of updated information periodically and/or whenever there is some significant change).
  • the transaction may be ended after some additional responses.
  • the described transaction may be realized by the execution of one procedure defined as a request and a response, followed by one or several procedures initiated by the NG-RAN node (each procedure defined as a single message) to realize the additional responses.
  • An example of LPPa transaction type may be "location Information Transfer".
  • location information applies both to an actual position estimate and to values used in computing position (e.g., radio measurements or positioning measurements).
  • Example of Location information transfer 1.
  • the server sends a request for location related information to the NG-RAN node, and indicates the type of location information needed and associated Qos.
  • the request may refer to a particular UE.
  • the NG-RAN Node transfers location related information to the server.
  • the location related information transferred should match the location related information requested in step 1.
  • the NG-RAN node may transfer additional location related information to the server in one or more additional NRPPa messages when the positioning method is E-CID for E-UTRA.
  • a message exchanged (transmitted and received) between a UE (a target device)/location server for positioning and a configuration related to the message may be based on Table 11 below.
  • the positioning measurement methods supported by NG-RAN may include GNSS, OTDOA, E-CID (enhanced cell ID), Multi RTT (round trip time)/Multi-cell RTT, barometric pressure sensor positioning, WLAN positioning, Bluetooth positioning, and TBS (terrestrial beacon system), UTDOA (Uplink Time Difference of Arrival), etc.
  • GNSS Global System for Mobile Communications
  • OTDOA enhanced cell ID
  • E-CID enhanced cell ID
  • Multi RTT round trip time
  • Multi-cell RTT barometric pressure sensor positioning
  • WLAN positioning Bluetooth positioning
  • TBS terrestrial beacon system
  • UTDOA Uplink Time Difference of Arrival
  • FIG. 12 is a diagram illustrating an example of an OTDOA positioning measurement method.
  • the OTDOA positioning measurement method uses the measurement timing of downlink signals received by the UE from multiple TPs including an eNB, an ng-eNB, and a PRS-only TP.
  • the UE measures the timing of the received downlink signals by using the location assistance data received from the location server.
  • the location of the UE may be determined based on these measurement results and the geographic coordinates of the contiguous TPs.
  • a UE connected to the gNB may request a measurement gap for OTDOA measurement from the TP. If the UE does not recognize the SFN for at least one TP in the OTDOA assistance data, the UE may use the autonomous gap to obtain the SFN of the OTDOA reference cell before requesting the measurement gap for performing Reference Signal Time Difference (RSTD) measurement.
  • RSTD Reference Signal Time Difference
  • the RSTD may be defined based on the smallest relative time difference between the boundaries of two subframes respectively received from the reference cell and the measurement cell. That is, it may be calculated based on the relative time difference between the start times of the subframes of the reference cell closest to the start time of the subframe received from the measurement cell. Meanwhile, the reference cell may be selected by the UE.
  • the TOA for each of TP 1 , TP 2 and TP 3 may be measured, the RSTD for TP 1-TP 2, the RSTD for TP 2-TP 3, and the RSTD for TP 3-TP 1 may be calculated based on the three TOAs, a geometric hyperbola may be determined based on this, and a point where these hyperbola intersects may be estimated as the location of the UE.
  • the estimated location of the UE may be known as a specific range depending on the measurement uncertainty.
  • RSTDs for two TPs may be calculated based on Equation 3 below.
  • RSTD i , 1 x t ⁇ x i 2 + y t ⁇ y i 2 c ⁇ x t ⁇ x 1 2 + y t ⁇ y 1 2 c + T i ⁇ T 1 + n i ⁇ n 1
  • c may be the speed of light
  • ⁇ xt, yt ⁇ may be the (unknown) coordinates of the target UE
  • ⁇ xi, yi ⁇ may be the coordinates of the (known) TP
  • ⁇ 25, y1 ⁇ may be the coordinates of the reference TP (or other TP).
  • (Ti-T1) is a transmission time offset between two TPs, which may be referred to as "Real Time Differences" (RTDs)
  • ni and n1 may represent values related to UE TOA measurement errors.
  • E-CID Enhanced Cell ID
  • the location of the UE may be measured through geographic information of the serving ng-eNB, the serving gNB and/or the serving cell of the UE.
  • geographic information of the serving ng-eNB, the serving gNB, and/or the serving cell may be obtained through paging, registration, or the like.
  • the E-CID positioning measurement method may use additional UE measurement and/or NG-RAN radio resources and the like for improving the UE location estimate in addition to the CID positioning measurement method.
  • some of the same measurement methods as those of the measurement control system of the RRC protocol may be used, but in general, additional measurement is not performed only for the location measurement of the UE.
  • a separate measurement configuration or measurement control message may not be provided to measure the location of the UE, and the UE also does not expect that an additional measurement operation only for location measurement will be requested, and the UE may report a measurement value obtained through generally measurable measurement methods.
  • the serving gNB may implement the E-CID positioning measurement method using the E-UTRA measurement provided from the UE.
  • An example of a measurement element that can be used for E-CID positioning may be as follows.
  • TADV may be divided into Type 1 and Type 2 as follows.
  • TADV Type 1 ng ⁇ eNB reception ⁇ transmission time difference + UE E ⁇ UTRA reception ⁇ transmission time difference
  • TADV Type 2 ng ⁇ eNB reception ⁇ transmission time difference
  • AoA may be used to measure the direction of the UE.
  • AoA may be defined as an estimated angle for the location of the UE in a counterclockwise direction from the base station/TP. In this case, the geographic reference direction may be north.
  • the base station/TP may use an uplink signal such as a sounding reference signal (SRS) and/or a demodulation reference signal (DMRS) for AoA measurement.
  • SRS sounding reference signal
  • DMRS demodulation reference signal
  • the larger the antenna array arrangement the higher the AoA measurement accuracy, when the antenna arrays are arranged at the same interval, signals received from contiguous antenna elements may have a constant phase-rotate.
  • UTDOA is a method of determining the location of the UE by estimating the arrival time of the SRS.
  • the location of the UE may be estimated through the difference in arrival time with another cell (or base station/TP) by using the serving cell as a reference cell.
  • the E-SMLC may instruct the serving cell of the target UE to instruct the target UE to transmit SRS.
  • the E-SMLC may provide configuration such as whether the SRS is periodic/aperiodic, bandwidth, and frequency/group/sequence hopping, etc.
  • Multi-cell RTT Multi-cell RTT
  • RTT is based on TOA measurement like the OTDOA, but requires only coarse TRP (e.g. base station) timing synchronization.
  • TRP e.g. base station
  • FIGS. 13A and 13B are diagrams illustrating an example of a Multi RTT positioning measurement method.
  • an RTT process in which TOA measurement is performed in an initiating device and a responding device, and the responding device provides the TOA measurement to the initiating device for RTT measurement (calculation), is exemplified.
  • the initiating device may be a TRP and/or a UE
  • the responding device may be the UE and/or the TRP.
  • the initiating device may transmit an RTT measurement request, and the responding device may receive it.
  • the initiating device may transmit an RTT measurement signal at t0, and the responding device may acquire a TOA measurement t1.
  • the responding device may transmit the RTT measurement signal at t2, and the initiating device may acquire a TOA measurement t3.
  • the responding device may transmit information on [t2-t1], and the initiating device may receive the corresponding information and calculate the RTT based on Equation 4 below.
  • the corresponding information may be transmitted/received based on a separate signal, or may be transmitted/received by being included in the RTT measurement signal of B805.
  • RTT t 3 ⁇ t 0 ⁇ t 2 ⁇ t 1
  • the corresponding RTT may correspond to double-range measurement between two devices. Positioning estimation may be performed from the corresponding information, and a multilateration technique may be used. Based on the measured RTT, d1, d2, and d3 may be determined, and the target device location may be determined by the intersection of the circumference with each BS1, BS2, BS3 (or TRP) as a center and each d1, d2, and d3 as a radius.
  • the measurement based on GPS or GNSS has performance limitation (error) depending on GPS/GNSS receiver type/capability.
  • GNSS global navigation satellite system
  • PNT navigation and timing
  • the global positioning system (GPS) is one type of various types related to the GNSS.
  • the reference station(s) is a station where a GNSS receiver is installed at a known location and is used for compensate the limitation (error) of services. The location is pre-surveyed by either traditional methods or by GNSS observation from multiple days.
  • a reference UE and/or a reference gNB may be introduced to mitigate the remaining timing error using a UE or a TRP.
  • the reference i.e., the reference UE/reference gNB
  • the reference UE/reference gNB needs to be modified and applied to suit the NR system.
  • LPP(a) message In relation to the introduction of the reference UE, establishment of additional signaling (LPP(a) message) or related procedures suitable/required for positioning measurement of the NR system is required.
  • LMF may request the UE to measure a DL positioning reference signal through multiple methods. And then, the UE may report measurement instances (RSTD, DL RSRP and/or UE Rx-Tx time difference) to the LMF in a single measurement report.
  • the gNB/TRP also may report multiple measurement instances in a single measurement to the LMF.
  • there is currently no requirement to enforce the DL and UL measurements are associated with the same set of DL PRS and UL SRS resources and the same timestamp.
  • the reference UE such as configuration conditions and report contents described in the present disclosure, may also be equally applied to the reference TRP (or reference gNB).
  • the reception-related configuration e.g., Rx beam
  • the transmission-related configuration e.g., Tx beam
  • Table 13 below shows agreements related to the measurement instances.
  • TEG timing error group
  • Agreement The following definitions are used for the purpose of discussion of internal timing errors (these terms are not agreed to be included in the specifications): • Tx timing error: From a signal transmission perspective, there will be a time delay from the time when the digital signal is generated at baseband to the time when the RF signal is transmitted from the Tx antenna.
  • the UE/TRP may implement an internal calibration/compensation of the Tx time delay for the transmission of the DL PRS/UL SRS signals, which may also include the calibration/compensation of the relative time delay between different RF chains in the same TRP/UE.
  • the compensation may also possibly consider the offset of the Tx antenna phase center to the physical antenna center.
  • the calibration may not be perfect.
  • the remaining Tx time delay after the calibration, or the uncalibrated Tx time delay is defined as Tx timing error.
  • Rx timing error From a signal reception perspective, there will be a time delay from the time when the RF signal arrives at the Rx antenna to the time when the signal is digitized and time-stamped at the baseband.
  • the UE/TRP may implement an internal calibration/compensation of the Rx time delay before it reports the measurements that are obtained from the DL PRS/UL SRS signals, which may also include the calibration/compensation of the relative time delay between different RF chains in the same TRP/UE.
  • the compensation may also possibly consider the offset of the Rx antenna phase center to the physical antenna center.
  • the calibration may not be perfect.
  • the remaining Rx time delay after the calibration, or the uncalibrated Rx time delay is defined as Rx timing error.
  • UE Tx 'timing error group' UE Tx TEG
  • a UE Tx TEG is associated with the transmissions of one or more UL SRS resources for the positioning purpose, which have the Tx timing errors within a certain margin.
  • TRP Tx 'timing error group' A TRP Tx TEG is associated with the transmissions of one or more DL PRS resources, which have the Tx timing errors within a certain margin.
  • UE Rx 'timing error group' A UE Rx TEG is associated with one or more DL measurements, which have the Rx timing errors within a certain margin.
  • TRP Rx 'timing error group' A TRP Rx TEG is associated with one or more UL measurements, which have the Rx timing errors within a margin.
  • UE RxTx 'timing error group' A UE RxTx TEG is associated with one or more UE Rx-Txtime difference measurements, and one or more UL SRS resources for the positioning purpose, which have the 'Rx timing errors+Tx timing errors' within a certain margin.
  • TRP RxTx 'timing error group' A TRP RxTx TEG is associated with one or more gNB Rx-Tx time difference measurements and one or more DL PRS resources, which have the 'Rx timing errors+Tx timing errors' within a certain margin.
  • a timing error and a measurement time window are described in detail below with reference to FIG. 15 .
  • FIG. 14 illustrates an example of RTT considering a timing error at a UE and a TRP where the same propagation time of UL and DL is assumed.
  • RTT 1 2 ⁇ T p TRP 1 + e Tx TRP 1 + e Rx TRP 1 + e Tx UE + e Rx UE
  • RTT 2 2 ⁇ T p TRP 2 + e Tx TRP 2 + e Rx TRP 2 + e Tx UE + e Rx UE
  • RTT 3 2 ⁇ T p TRP 3 + e Tx TRP 3 + e Rx TRP 3 + e Tx UE + e Rx UE
  • RTT 4 2 ⁇ T p TRP 4 + e Tx TRP 4 + e Rx TRP 4 + e Tx UE + e Rx UE
  • RTT i is RTT between the UE and TRP#i
  • T p TRPi is DL/UL propagation time between the UE and TRP#i
  • e Tx TRPi is a TX timing error at TRP#i
  • e Rx TRPi is an RX timing error at TRP#i
  • e Tx UE is a TX timing error at the UE
  • e Rx UE is an RX timing error at the UE.
  • RTT 1 ⁇ RTT 2 2 ⁇ T p TRP 1 ⁇ 2 ⁇ T p TRP 2 + e Tx TRP 1 + e Rx TRP 1 ⁇ e Tx TRP 2 + e Rx TRP 2
  • RTT 3 ⁇ RTT 2 2 ⁇ T p TRP 3 ⁇ 2 ⁇ T p TRP 2 + e Tx TRP 3 + e Rx TRP 3 ⁇ e Tx TRP 2 + e Rx TRP 2
  • RTT 4 ⁇ RTT 2 2 ⁇ T p TRP 4 ⁇ 2 ⁇ T p TRP 2 + e Tx TRP 4 + e Rx TRP 4 ⁇ e Tx TRP 2 + e Rx TRP 2
  • Equation 6 the term of UE Tx/Rx timing error effect is eliminated. It can be seen from the above results that the performance of timing measurement can be improved if the TX/RX timing error at the TRP is known. For this reason, the introduction of a reference device (e.g., reference UE) may be considered.
  • a reference device e.g., reference UE
  • the reference device should guarantee the accuracy and precision for measurement results.
  • the accuracy and precision of measurement results are closely related to changes in the position during pre-survey.
  • the probability of improving the accuracy and precision can be increased if the mobility and/or rotation of the reference device are/is small during the pre-survey.
  • the gNB and the UE that are currently discussed as the reference device have different characteristics of mobility, associated behavior and reporting contents and/or LPP(a) messages may be different.
  • separate configuration/definition may be required depending on whether the reference device is the UE or the TRP.
  • the subject of the decision of the reference UE can be UE itself or LMF.
  • the relevant procedure and information (message) may vary depending on the subject of the decision of the reference UE as follows.
  • Whether the UE corresponds to the reference UE may be decided by UE itself.
  • the UE may be possible to determine itself as a reference device based on measured information. In that case, the UE needs to provide LMF with information about whether or not the UE has capability of the reference UE through a capability message (capability information).
  • capability information information about whether or not the UE has capability of the reference UE through a capability message (capability information).
  • the LMF and/or gNB
  • the LMF or the gNB may configure the variance of UE location and the required measurement duration (window) that satisfies it.
  • the UE determines for itself as a reference device when the requirement is satisfied. Specifically, the UE may determine for itself as a reference UE if the location of the UE does not exceed a designated maximum amount of change within a given time.
  • the above condition information may be broadcasted through system information, or UE-specifically transmitted via RRC or MAC CE, or transmitted through the LPP message.
  • a value for time related to change in the location of the UE may be dynamically configured or defined based on a specific rule.
  • the value for time (e.g., time duration) related to the location change of the UE may be defined as time from the time, at which a request (or report) for the previous positioning measurement is received from the LMF/TRP (or transmitted to the LMF/TRP), to the time at which a request (or report) for the positioning measurement at the current time is received from the LMF/TRP (or transmitted to the LMF/TRP).
  • a time duration for the decision of the reference UE may be defined as a time duration from the time, at which a request for the previous positioning measurement is received, to the time at which a request for the next positioning measurement is received.
  • a time duration for the decision of the reference UE may be defined as a time duration from the time, at which a report of the previous positioning measurement is transmitted, to the time at which a report of the next positioning measurement is transmitted.
  • the value for time (e.g., time duration) related to the location change of the UE may be defined as a duration from the time, at which condition information for the decision of the reference UE is received, to x symbol/slot/frame.
  • the value for time related to the location change of the UE may be i) defined as a specific time duration, or ii) mean a duration from the time, at which condition information related to the determination of the reference UE is received, to a certain time (x symbol/slot/frame).
  • the condition information related to the determination of the reference UE may be defined as a received signal strength including at least one of RSRP, RSRQ and/or RSSI. This is because if change in reception performance is small, the location change of the UE can be judged to be small.
  • condition information related to the determination of the reference UE may include information for the maximum change amount for the received signal strength (change amount for at least one of RSRP, RSRQ and/or RSSI).
  • the maximum change amount for the received signal strength may be configured for the UE operating in the UE-assisted mode, and the condition information related to the determination of the reference UE including the maximum change amount for the received signal strength may be received from the BS/LMF.
  • the UE may decide a signal strength acquired from other DL channel (PDSCH, PDCCH) as well as the reference signal and determine for itself whether it corresponds to the reference UE. After the time at which the UE determines that it corresponds to the reference UE, the UE may transmit information representing, that it is the reference UE, separately from reporting of the positioning measurement. Specifically, when the UE responds to the request for the positioning measurement requested to the BS (TRP)/LMF, the UE may transmit separately/together information representing that a result value transmitted at the same time as the information representing, that the UE is the reference UE, has reliability.
  • TRP BS
  • Whether the UE corresponds to the reference UE may be decided by the position server LMF.
  • the LMF may directly determine the reference UE based on the location information obtained from each UE.
  • the detailed configuration related to the determination of the reference UE may depend on LMF implementation. Furthermore, since the detailed procedure for the reference UE does not seem to be different from that of normal UEs, it may not be necessary to discuss about this in detail.
  • the UE may monitor whether conditions for the determination of the reference UE are satisfied. If the conditions for the determination of the reference UE are satisfied, the UE may inform the LMF/gNB that the conditions have been satisfied (i.e., the UE may transmit, to the LMF/gNB, information representing that the conditions have been satisfied). The UE may also transmit triggering for the positioning measurement to the LMF/gNB.
  • the base station may indicate the positioning measurement to determine whether the UE can be the reference device from that point in time and may obtain a result for the positioning measurement from the UE. Based on the acquired measurement information, the LMF may determine whether the UE corresponds to the reference UE.
  • the reference UE may indicate whether or not it is the reference device. That is, information for the measurement of PRS reported by the UE may include information representing whether the UE corresponds to the reference UE. Alternatively, the information representing whether the UE corresponds to the reference UE may be reported to the TRP/LMF separately from the information for the measurement of PRS.
  • the reference UE may provide additional information such as Tx/Rx TEG of the TRP.
  • the reporting periodicity may also vary depending on the reporting elements.
  • the information for the measurement of PRS reported by the UE may include additional information such as Tx/Rx TEG of the TRP.
  • the additional information such as Tx/Rx TEG of the TRP may be reported to the TRP/LMF separately from the information for the measurement of PRS. The additional information is described in detail below.
  • the reference UE can additionally measure reporting contents according to the following i) to v)
  • information for the results can be transmitted to the location server (LMF) through the measurement report.
  • LMF location server
  • the additionally reported information may include at least one of the following i) to v).
  • the Tx TEG of the TRP may be based on the definition of TRP Tx TEG in Table 14.
  • the value may be an absolute value as above and may be a relative value per Tx TEG.
  • the UE may transmit an index of the table matched (mapped) to the corresponding value. This is because the TEG itself is classified by the range, and there is a gain in terms of signaling overhead when the corresponding index value is used.
  • v Timing error between Rx TEGs of a single UE
  • the Rx TEG of the UE may be based on the definition of UE Rx TEG in Table 14.
  • the value may be an absolute value as above and may be a relative value per Rx TEG.
  • the UE may transmit an index of the table matched (mapped) to the corresponding value. This is because the TEG itself is classified by the range, and there is a gain in terms of signaling overhead when the corresponding index value is used.
  • i and j each denote an index of the TRP
  • e TX TEG 1 TRPi represents a timing error for TxTEG#1 of TRP i.
  • the UE may continue to monitor the above values (i.e., the above i) to v)) and report information including the corresponding value (at least one of the i) to v)) to the gNB/LMF if the monitored value satisfies a configured event.
  • the UE may acquire periodicity information for the report from the gNB or the LMF and periodically transmit information including at least one of the i) to v) to the gNB/LMF.
  • the UE may transmit a result of measurement for at least one of the i) to v) to the gNB/LMF based on an indication for measurement of the corresponding value (at least one of the i) to v)). That is, the UE may aperiodically report the measurement result for at least one of the i) to v) based on an indication received from the gNB/LMF.
  • the measurement result may be transmitted in a bitmap form and may include single or multiple measurement results.
  • the reference UE may transmit not only the measurement result but also an identification factor to the gNB/LMF.
  • the reference device can compare a differential RTT value with RSTD + ROTA value and perform sync error extraction. This is described in detail below.
  • RSTD 12 T p TRP 1 ⁇ T p TRP 2 + e TX TRP 1 ⁇ e TX TRP 2 + ⁇ sync
  • RTOA 12 T p TRP 1 ⁇ T p TRP 2 + e RX TRP 1 ⁇ e RX TRP 2 + ⁇ sync
  • the reference device may obtain UE Rx-Tx/RSTD measurement at the same specific time duration or the same measurement averaging/acquisition window and report it to the location server.
  • gNB Rx-Tx/RTOA measurement for the reference device may be obtained at the same specific time duration or the same measurement averaging/acquisition window, and may be reported to the location server.
  • FIG. 15 illustrates timing measurement using different Rx/Tx TEGs at a UE and a TRP. More specifically, FIG. 15 illustrates a scenario when the above-described TEG is applied, and each of Rx/Tx TEG for both the UE and the TRP may be changed depending on measurement time.
  • the measurement result may include multiple result values obtained through different Rx/Tx TEGs at both the UE and a TRP.
  • a motivation for introducing the measurement time window may be ambiguous. That is, even if the measurement time window is configured, improvement in measurement accuracy may not be guaranteed.
  • a rule for guaranteeing the same Rx/Tx TEG at both the UE and the TRP within the measurement time window may be configured.
  • a TEG ID or value e.g., timing margin or offset
  • separate signaling for reporting the corresponding information e.g., the TEG ID/timing margin or offset
  • resource configuration e.g., configuration of SRS for positioning or configuration of PRS resource
  • an LMF may perform configuration of SRS for positioning or configuration of PRS resource based on the information received from the reference UE (or the reference TRP).
  • the LMF may give priority to configuration information for a TRP acquiring a timing error over configuration information for a normal TRP, and may perform the above-described configuration (SRS/PRS related configuration).
  • the LMF may transmit a factor, that distinguishes the TRP acquiring the timing error and the normal TRP, by including the factor upon a positioning measurement request.
  • the operations e.g., operations related to the positioning measurement
  • the operations of the UE/BS/location server may be processed by a device of FIGS. 20 to 24 (e.g., processors 102 and 202 of FIG. 21 ) to be described below.
  • the operations may be stored in a memory (e.g., 104 and 204 of FIG. 21 ) in the form of commands/programs (e.g., instructions, executable codes) for running at least one processor (e.g., 102 and 202 of FIG. 21 ).
  • commands/programs e.g., instructions, executable codes
  • FIG. 16 is a diagram illustrating operations of a UE, TRP, and LMF to which a method proposed in the present disclosure can be applied.
  • the location server and/or the LMF may transmit configuration information to the UE, and the UE may receive it.
  • the location server and/or the LMF may transmit reference configuration information to a transmission and reception point (TRP), and the TRP may receive it.
  • TRP transmission and reception point
  • the TRP may transmit reference configuration information to the UE, and the UE may receive it.
  • the operation 2001 according to the exemplary embodiment may be omitted.
  • the operations 2001 according to an exemplary embodiment and the operations 2003 and 2005 according to an exemplary embodiment may be optional.
  • the TRP may transmit a signal related to configuration information to the UE, and the UE may receive it.
  • the signal related to the configuration information may be a signal for positioning of the UE.
  • the UE may transmit a signal related to positioning to the TRP, and the TRP may receive it.
  • the TRP may transmit the signal related to positioning to the location server and/or the LMF, and the location server and/or the LMF may receive it.
  • the UE may transmit the signal related to positioning to the location server and/or the LMF, and the location server and/or the LMF may receive it.
  • operations 2009 and 2011 according to the exemplary embodiment may be omitted.
  • operation 2013 according to an exemplary embodiment may be omitted.
  • operations 2009 and 2011 according to the exemplary embodiment may be performed.
  • operations 2009 and 2011 according to an exemplary embodiment and operations 2013 according to an exemplary embodiment may be optional.
  • the signal related to positioning may be obtained based on the configuration information and/or the signal related to the configuration information.
  • FIG. 17 is a flowchart for explaining an operation of each UE, TRP and LMF to which a method proposed in the present disclosure can be applied.
  • the UE may receive configuration information.
  • the UE may receive a signal related to configuration information.
  • the UE may transmit information related to positioning.
  • the TRP may receive configuration information from the location server and/or the LMF, and may transmit it to the UE.
  • the TRP may transmit the signal related to configuration information.
  • the TRP may receive information related to positioning, and may transmit it to the location server and/or the LMF.
  • the location server and/or the LMF may transmit the configuration information.
  • the location server and/or the LMF may receive the information related to positioning.
  • FIGS. 7 to 17 will be described in detail with reference to FIG. 18 in terms of the operation of the UE.
  • Methods to be described below are divided for convenience of description, unless mutually excluded, and of course, some components of any one method may be substituted with some components of another method, or may be applied in combination with each other.
  • FIG. 18 is a flowchart illustrating a method for a UE to transmit information on measurement of PRS in a wireless communication system according to an embodiment of the present disclosure.
  • a method for a UE to transmit information on measurement of a Positioning Reference Signal (PRS) in a wireless communication system may include receiving configuration information related to the PRS (S1810), receiving the PRS (S1820), and transmitting the information on measurement of the PRS (51830).
  • PRS Positioning Reference Signal
  • the UE receives the configuration information related to the PRS from the location server.
  • the location server may refer to a Location Management Function (LMF) of FIG. 7 .
  • LMF Location Management Function
  • the S1810 may be based on the operation according to 2001 or 2003 and 2005 of FIG. 16 and the operation 2101 of FIG. 17 . That is, the configuration information related to the PRS may be i) directly transmitted from the location server to the UE, or ii) transmitted from the location server to the UE through the base station (TRP).
  • TRP base station
  • the configuration information related to the PRS may include a DL PRS resource set and/or a DL-PRS-Resource, which are higher layer parameters based on Table 7 above.
  • the present disclosure is not limited thereto, and the configuration information related to the PRS may further include other higher layer parameters defined in Table 7 above.
  • the configuration information related to the PRS may include information on a PRS resource set.
  • the information on the PRS resource set may include one or more PRS resource sets.
  • the PRS resource set may include one or more PRS resources.
  • the information on the PRS resource set may be based on the DL PRS resource set configuration of Table 7 above.
  • signaling (S1810) between the UE and the location server may be performed based on a protocol for positioning.
  • the configuration information related to the PRS may be received based on an LTE Positioning Protocol (LPP).
  • LTP LTE Positioning Protocol
  • the operation of the UE (100/200 in FIGS. 20 to 24 ) receiving the configuration information related to the PRS from the location server (100/200 in FIGS. 20 to 24 ) may be implemented by the device of FIGS. 20 to 24 .
  • the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 to receive the configuration information related to the PRS from the location server 200.
  • the UE receives the PRS from the base station.
  • the base station may be based on a reference source (e.g. a transmission and reception point (TRP)) of FIG. 7
  • the PRS may be based on the radio signals of FIG. 7 .
  • the S1820 may be based on the operation according to 2007 of FIG. 16 , and the operation 2103 of FIG. 17 .
  • the reception of the PRS may be performed as defined in Tables 6 and 7 above.
  • the operation of the UE (100/200 in FIGS. 20 to 24 ) receiving the PRS from the base station (100/200 in FIGS. 20 to 24 ) may be implemented by the device of FIGS. 20 to 24 .
  • the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 to receive the PRS from base station 200.
  • the UE transmits information on the measurement of the PRS to the location server.
  • the S1830 may be based on the operation according to 2009, 2011, or 2013 of FIG. 16 and the operation 2105 of FIG. 17 . That is, the information on the measurement of the PRS may be i) transmitted directly from the UE to the location server, or ii) transmitted from the UE to the location server through the base station (TRP).
  • TRP base station
  • the information on the measurement of the PRS may be performed as defined in Table 7 above.
  • the information on the measurement of the PRS may include a Reference Signal Time Difference (RSTD) related to the PRS and/or a Reference Signal Received Power (RSRP) related to the PRS.
  • RSTD Reference Signal Time Difference
  • RSRP Reference Signal Received Power
  • information for the measurement of the PRS may include information representing whether the UE is a reference UE.
  • the present embodiment may be based on Case #1 related to the determination of the reference UE described above.
  • Whether the UE is the reference UE may be determined based on condition information related to the determination of the reference UE.
  • the condition information related to the determination of the reference UE may include information for at least one of i) a maximum change amount of a received signal strength, ii) a maximum movement change amount, and/or iii) a specific time duration.
  • the information included in the condition information related to the determination of the reference UE may vary depending on an operation mode of the UE related to a positioning.
  • condition information related to the determination of the reference UE may include information for the maximum change amount.
  • the condition information related to the determination of the reference UE may further include information for the maximum change amount of the received signal strength and/or information for the specific time duration.
  • condition information related to the determination of the reference UE may include information for the maximum change amount of the received signal strength.
  • the condition information related to the determination of the reference UE may further include information for the specific time duration.
  • the specific time duration may be determined based on the condition information related to the determination of the reference UE.
  • the specific time duration may be determined based on a time related to the operation of the UE.
  • the specific time duration may be determined based on a reception time of the condition information related to the determination of the reference UE and a preset value (e.g., x symbol/slot/subframe).
  • the specific time duration may be determined based on a transmission time of the information for the measurement of the PRS and a previous transmission time of the information for the measurement of the PRS.
  • the specific time duration may be determined based on a reception time of a request message for the measurement of the PRS and a previous reception time of the request message for the measurement of the PRS.
  • condition information related to the determination of the reference UE may include a value (e.g., the x symbol/slot/subframe) for the determination of the specific time duration and/or information for a reference time (e.g., information transmission time for the PRS measurement, the reception time of the request message for the PRS measurement, etc.) for the determination of the specific time duration.
  • a value e.g., the x symbol/slot/subframe
  • a reference time e.g., information transmission time for the PRS measurement, the reception time of the request message for the PRS measurement, etc.
  • the UE may be determined as the reference UE based on the condition information related to the determination of the reference UE.
  • the UE may be determined as the reference UE.
  • the UE may be a UE operating in the UE-assisted mode or the UE-based mode.
  • the UE may be determined as the reference UE.
  • the UE may be a UE operating in the UE-based mode.
  • the condition information related to the determination of the reference UE may be configured based on an RRC message, a medium access control-control element (MAC-CE), or an LTE Positioning Protocol (LPP) message.
  • the condition information related to the determination of the reference UE may be transmitted from the base station to the UE based on the RRC message or the MAC-CE.
  • the condition information related to the determination of the reference UE may be transmitted from the location server to the UE based on the LPP message.
  • the information for the measurement of the PRS may further include additional information related to at least one of a timing error related to the base station, a propagation time related to the base station, and/or a timing error group (TEG) related to the base station.
  • the additional information may include reporting contents based on at least one of the i) to v) in the above-described Case #1.
  • the timing error related to the base station may include a transmit (Tx) timing error and/or a receive (Rx) timing error at TRP(s) related to the base station.
  • Tx transmit
  • Rx receive
  • the propagation time related to the base station may include a propagation time at TRP(s) related to the base station.
  • the timing error group related to the base station may include a Tx TEG and/or an Rx TEG at TRP(s) related to the base station.
  • signaling (S1830) between the UE and the location server may be performed based on a protocol for positioning.
  • the information on the measurement of the PRS may be transmitted based on an LTE Positioning Protocol (LPP).
  • LTP LTE Positioning Protocol
  • the operation of the UE (100/200 in FIGS. 20 to 24 ) transmitting information on the measurement of the PRS to the location server (100/200 in FIGS. 20 to 24 ) may be implemented by the device of FIGS. 20 to 24 .
  • the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 to transmit the information on the measurement of the PRS to the location server 200.
  • the method may further include transmitting capability information before the S1810. Specifically, the UE may transmit, to the location server, the capability information representing whether the UE is able to operate as the reference UE.
  • the operation of the UE (100/200 in FIGS. 20 to 24 ) transmitting, to the location server (100/200 in FIGS. 20 to 24 ), the capability information representing whether the UE is able to operate as the reference UE may be implemented by the device of FIGS. 20 to 24 .
  • the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 to transmit, to the location server 200, the capability information representing whether the UE is able to operate as the reference UE.
  • FIGS. 7 to 17 will be described in detail with reference to FIG. 19 in terms of the operation of the location server.
  • Methods to be described below are divided for convenience of description, unless mutually excluded, and of course, some components of any one method may be substituted with some components of another method, or may be applied in combination with each other.
  • FIG. 19 is a flowchart illustrating a method for a location server to receive information on measurement of PRS in a wireless communication system according to another embodiment of the present disclosure.
  • a method for a location server to receive information on measurement of a Positioning Reference Signal (PRS) in a wireless communication system may include transmitting configuration information related to the PRS (S1910) and receiving information on the measurement of the PRS (S1920).
  • PRS Positioning Reference Signal
  • the location server transmits the configuration information related to the PRS to the UE.
  • the UE may refer to the target device of FIG. 7 .
  • the S1910 may be based on the operation according to 2001 or 2003 and 2005 of FIG. 16 and the operation 2301 of FIG. 17 . That is, the configuration information related to the PRS may be i) directly transmitted from the location server to the UE, or ii) transmitted from the location server to the UE through the base station (TRP).
  • TRP base station
  • the PRS is transmitted from the base station to the UE.
  • the base station may be based on a reference source (e.g. a transmission and reception point (TRP)) of FIG. 7 , and the PRS may be based on the radio signals of FIG. 7 .
  • Transmission of the PRS by the base station may be performed as defined in Tables 6 and 7 above.
  • the configuration information related to the PRS may include a DL PRS resource set and/or a DL-PRS-Resource, which are higher layer parameters based on Table 7 above.
  • present disclosure is not limited thereto, and the configuration information related to the PRS may further include other higher layer parameters defined in Table 7 above.
  • the configuration information related to the PRS may include information on a PRS resource set.
  • the information on the PRS resource set may include one or more PRS resource sets.
  • the PRS resource set may include one or more PRS resources.
  • the information on the PRS resource set may be based on the DL PRS resource set configuration of Table 7 above.
  • signaling (S1910) between the location server and the UE may be performed based on a protocol for positioning.
  • the configuration information related to the PRS may be transmitted based on an LTE Positioning Protocol (LPP).
  • LTP LTE Positioning Protocol
  • the operation of the location server (100/200 in FIGS. 20 to 24 ) transmitting the configuration information related to the PRS to the UE (100/200 in FIGS. 20 to 24 ) may be implemented by the device of FIGS. 20 to 24 .
  • the one or more processors 202 may control one or more transceivers 206 and/or one or more memories 204 to transmit the configuration information related to the PRS to the UE 100.
  • the location server receives information on the measurement of the PRS from the UE.
  • the S1920 may be based on the operation according to 2009, 2011, or 2013 of FIG. 16 and the operation 2305 of FIG. 17 . That is, the information on the measurement of the PRS may be i) transmitted directly from the UE to the location server, or ii) transmitted from the UE to the location server through the base station (TRP).
  • TRP base station
  • the information on the measurement of the PRS may include a Reference Signal Time Difference (RSTD) related to the PRS and/or a Reference Signal Received Power (RSRP) related to the PRS.
  • RSTD Reference Signal Time Difference
  • RSRP Reference Signal Received Power
  • information for the measurement of the PRS may include information representing whether the UE is a reference UE.
  • the present embodiment may be based on Case #1 related to the determination of the reference UE described above.
  • Whether the UE is the reference UE may be determined based on condition information related to the determination of the reference UE.
  • the condition information related to the determination of the reference UE may include information for at least one of i) a maximum change amount of a received signal strength, ii) a maximum movement change amount, and/or iii) a specific time duration.
  • the information included in the condition information related to the determination of the reference UE may vary depending on an operation mode of the UE related to a positioning.
  • condition information related to the determination of the reference UE may include information for the maximum change amount.
  • the condition information related to the determination of the reference UE may further include information for the maximum change amount of the received signal strength and/or information for the specific time duration.
  • condition information related to the determination of the reference UE may include information for the maximum change amount of the received signal strength.
  • the condition information related to the determination of the reference UE may further include information for the specific time duration.
  • the specific time duration may be determined based on the condition information related to the determination of the reference UE.
  • the specific time duration may be determined based on a time related to the operation of the UE.
  • the specific time duration may be determined based on a reception time of the condition information related to the determination of the reference UE and a preset value (e.g., x symbol/slot/subframe).
  • the specific time duration may be determined based on a transmission time of the information for the measurement of the PRS and a previous transmission time of the information for the measurement of the PRS.
  • the specific time duration may be determined based on a reception time of a request message for the measurement of the PRS and a previous reception time of the request message for the measurement of the PRS.
  • condition information related to the determination of the reference UE may include a value (e.g., the x symbol/slot/subframe) for the determination of the specific time duration and/or information for a reference time (e.g., information transmission time for the PRS measurement, the reception time of the request message for the PRS measurement, etc.) for the determination of the specific time duration.
  • a value e.g., the x symbol/slot/subframe
  • a reference time e.g., information transmission time for the PRS measurement, the reception time of the request message for the PRS measurement, etc.
  • the UE may be determined as the reference UE based on the condition information related to the determination of the reference UE.
  • the UE may be determined as the reference UE.
  • the UE may be a UE operating in the UE-assisted mode or the UE-based mode.
  • the UE may be determined as the reference UE.
  • the UE may be a UE operating in the UE-based mode.
  • the condition information related to the determination of the reference UE may be configured based on an RRC message, a medium access control-control element (MAC-CE), or an LTE Positioning Protocol (LPP) message.
  • the condition information related to the determination of the reference UE may be transmitted from the base station to the UE based on the RRC message or the MAC-CE.
  • the condition information related to the determination of the reference UE may be transmitted from the location server to the UE based on the LPP message.
  • the information for the measurement of the PRS may further include additional information related to at least one of a timing error related to the base station, a propagation time related to the base station, and/or a timing error group (TEG) related to the base station.
  • the additional information may include reporting contents based on at least one of the i) to v) in the above-described Case #1.
  • the timing error related to the base station may include a transmit (Tx) timing error and/or a receive (Rx) timing error at TRP(s) related to the base station.
  • Tx transmit
  • Rx receive
  • the propagation time related to the base station may include a propagation time at TRP(s) related to the base station.
  • the timing error group related to the base station may include a Tx TEG and/or an Rx TEG at TRP(s) related to the base station.
  • signaling (S1920) between the location server and the UE may be performed based on a protocol for positioning.
  • the information on the measurement of the PRS may be received based on an LTE Positioning Protocol (LPP).
  • LTP LTE Positioning Protocol
  • the operation of the location server (100/200 in FIGS. 20 to 24 ) receiving information on the measurement of the PRS from the UE (100/200 in FIGS. 20 to 24 ) may be implemented by the device of FIGS. 20 to 24 .
  • the one or more processors 202 may control one or more transceivers 206 and/or one or more memories 204 to receive the information on the measurement of the PRS from the UE 100.
  • the method may further include receiving capability information before the S1910.
  • the location server may receive, from the UE, the capability information representing whether the UE is able to operate as the reference UE.
  • the operation of the location server (100/200 in FIGS. 20 to 24 ) receiving, from the UE (100/200 in FIGS. 20 to 24 ), the capability information representing whether the UE is able to operate as the reference UE may be implemented by the device of FIGS. 20 to 24 .
  • the one or more processors 102 may control one or more transceivers 106 and/or one or more memories 104 to receive, from the UE 100, the capability information representing whether the UE is able to operate as the reference UE.
  • FIG. 20 illustrates a communication system 1 applied to the present disclosure.
  • a communication system 1 applied to the present disclosure includes wireless devices, Base Stations (BSs), and a network.
  • the wireless devices represent devices performing communication using Radio Access Technology (RAT) (e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE)) and may be referred to as communication/radio/5G devices.
  • RAT Radio Access Technology
  • the wireless devices may include, without being limited to, a robot 100a, vehicles 100b-1 and 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an Artificial Intelligence (AI) device/server 400.
  • RAT Radio Access Technology
  • NR 5G New RAT
  • LTE Long-Term Evolution
  • the wireless devices may include, without being limited to, a robot 100a, vehicles 100b-1 and 100b-2, an eXtended Reality (XR) device 100c, a hand-held device 100d, a home appliance 100
  • the vehicles may include a vehicle having a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles.
  • the vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone).
  • UAV Unmanned Aerial Vehicle
  • the XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc.
  • the hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook).
  • the home appliance may include a TV, a refrigerator, and a washing machine.
  • the IoT device may include a sensor and a smartmeter.
  • the BSs and the network may be implemented as wireless devices and a specific wireless device 200a may operate as a BS/network node with respect to other wireless devices.
  • the wireless devices 100a to 100f may be connected to the network 300 via the BSs 200.
  • An AI technology may be applied to the wireless devices 100a to 100f and the wireless devices 100a to 100f may be connected to the AI server 400 via the network 300.
  • the network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network.
  • the wireless devices 100a to 100f may communicate with each other through the BSs 200/network 300, the wireless devices 100a to 100f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs/network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g.
  • V2V Vehicle-to-Vehicle
  • V2X Vehicle-to-everything
  • Wireless communication/connections 150a, 150b, or 150c may be established between the wireless devices 100a to 100fBS 200, or BS 200BS 200.
  • the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150a, sidelink communication 150b (or, D2D communication), or inter BS communication (e.g. relay, Integrated Access Backhaul(IAB)).
  • the wireless devices and the BSs/the wireless devices may transmit/receive radio signals to/from each other through the wireless communication/connections 150a and 150b.
  • the wireless communication/connections 150a and 150b may transmit/receive signals through various physical channels.
  • various configuration information configuring processes various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.
  • various signal processing processes e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping
  • resource allocating processes for transmitting/receiving radio signals
  • FIG. 21 illustrates wireless devices applicable to the present disclosure.
  • a first wireless device 100 and a second wireless device 200 may transmit radio signals through a variety of RATs (e.g., LTE and NR).
  • ⁇ the first wireless device 100 and the second wireless device 200 ⁇ may correspond to ⁇ the wireless device 100x and the BS 200 ⁇ and/or ⁇ the wireless device 100x and the wireless device 100x ⁇ of FIG. 20 .
  • the first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally further include one or more transceivers 106 and/or one or more antennas 108.
  • the processor(s) 102 may control the memory(s) 104 and/or the transceiver(s) 106 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor(s) 102 may process information within the memory(s) 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver(s) 106.
  • the processor(s) 102 may receive radio signals including second information/signals through the transceiver 106 and then store information obtained by processing the second information/signals in the memory(s) 104.
  • the memory(s) 104 may be connected to the processor(s) 102 and may store a variety of information related to operations of the processor(s) 102.
  • the memory(s) 104 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor(s) 102 and the memory(s) 104 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive radio signals through one or more antennas 108.
  • Each of the transceiver(s) 106 may include a transmitter and/or a receiver.
  • the transceiver(s) 106 may be interchangeably used with Radio Frequency (RF) unit(s).
  • the wireless device may represent a communication modem/circuit/chip.
  • the second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally further include one or more transceivers 206 and/or one or more antennas 208.
  • the processor(s) 202 may control the memory(s) 204 and/or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor(s) 202 may process information within the memory(s) 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver(s) 206.
  • the processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information obtained by processing the fourth information/signals in the memory(s) 204.
  • the memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202.
  • the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the processor(s) 202 and the memory(s) 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR).
  • the transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through one or more antennas 208.
  • Each of the transceiver(s) 206 may include a transmitter and/or a receiver.
  • the transceiver(s) 206 may be interchangeably used with RF unit(s).
  • the wireless device may represent a communication modem/circuit/chip.
  • One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202.
  • the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP).
  • the one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Unit (SDUs) according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • PDUs Protocol Data Units
  • SDUs Service Data Unit
  • the one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • the one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206.
  • the one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.
  • signals e.g., baseband signals
  • the one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers.
  • the one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions.
  • Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202.
  • the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, commands, and/or a set of commands.
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands.
  • the one or more memories 104 and 204 may be configured by Read-Only Memories (ROMs), Random Access Memories (RAMs), Electrically Erasable Programmable Read-Only Memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof.
  • the one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202.
  • the one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.
  • the one or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels, mentioned in the methods and/or operational flowcharts of this document, to one or more other devices.
  • the one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices.
  • the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices.
  • the one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, through the one or more antennas 108 and 208.
  • the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).
  • the one or more transceivers 106 and 206 may convert received radio signals/channels etc.
  • the one or more transceivers 106 and 206 may convert the user data, control information, radio signals/channels, etc. processed using the one or more processors 102 and 202 from the base band signals into the RF band signals.
  • the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.
  • FIG. 22 illustrates a signal process circuit for a transmission signal.
  • a signal processing circuit 1000 may include scramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040, resource mappers 1050, and signal generators 1060.
  • An operation/function of FIG. 22 may be performed, without being limited to, the processors 102 and 202 and/or the transceivers 106 and 206 of FIG. 21 .
  • Hardware elements of FIG. 22 may be implemented by the processors 102 and 202 and/or the transceivers 106 and 206 of FIG. 21 .
  • blocks 1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 21 .
  • the blocks 1010 to 1050 may be implemented by the processors 102 and 202 of FIG. 21 and the block 1060 may be implemented by the transceivers 106 and 206 of FIG. 21 .
  • Codewords may be converted into radio signals via the signal processing circuit 1000 of FIG. 22 .
  • the codewords are encoded bit sequences of information blocks.
  • the information blocks may include transport blocks (e.g., a UL-SCH transport block, a DL-SCH transport block).
  • the radio signals may be transmitted through various physical channels (e.g., a PUSCH and a PDSCH).
  • the codewords may be converted into scrambled bit sequences by the scramblers 1010.
  • Scramble sequences used for scrambling may be generated based on an initialization value, and the initialization value may include ID information of a wireless device.
  • the scrambled bit sequences may be modulated to modulation symbol sequences by the modulators 1020.
  • a modulation scheme may include pi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying (m-PSK), and m-Quadrature Amplitude Modulation (m-QAM).
  • Complex modulation symbol sequences may be mapped to one or more transport layers by the layer mapper 1030.
  • Modulation symbols of each transport layer may be mapped (precoded) to corresponding antenna port(s) by the precoder 1040.
  • Outputs z of the precoder 1040 may be obtained by multiplying outputs y of the layer mapper 1030 by an N*M precoding matrix W.
  • N is the number of antenna ports and M is the number of transport layers.
  • the precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) for complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.
  • transform precoding e.g., DFT
  • the resource mappers 1050 may map modulation symbols of each antenna port to time-frequency resources.
  • the time-frequency resources may include a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain.
  • the signal generators 1060 may generate radio signals from the mapped modulation symbols and the generated radio signals may be transmitted to other devices through each antenna.
  • the signal generators 1060 may include Inverse Fast Fourier Transform (IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-Analog Converters (DACs), and frequency up-converters.
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic Prefix
  • DACs Digital-to-Analog Converters
  • Signal processing procedures for a signal received in the wireless device may be configured in a reverse manner of the signal processing procedures 1010 to 1060 of FIG. 22 .
  • the wireless devices e.g., 100 and 200 of FIG. 21
  • the received radio signals may be converted into baseband signals through signal restorers.
  • the signal restorers may include frequency downlink converters, Analog-to-Digital Converters (ADCs), CP remover, and Fast Fourier Transform (FFT) modules.
  • ADCs Analog-to-Digital Converters
  • FFT Fast Fourier Transform
  • the baseband signals may be restored to codewords through a resource demapping procedure, a postcoding procedure, a demodulation processor, and a descrambling procedure.
  • a signal processing circuit for a reception signal may include signal restorers, resource demappers, a postcoder, demodulators, descramblers, and decoders.
  • FIG. 23 illustrates another example of a wireless device applied to the present disclosure.
  • wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 21 and may be configured by various elements, components, units/portions, and/or modules.
  • each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140.
  • the communication unit may include a communication circuit 112 and transceiver(s) 114.
  • the communication circuit 112 may include the one or more processors 102 and 202 and/or the one or more memories 104 and 204 of FIG. 21 .
  • the transceiver(s) 114 may include the one or more transceivers 106 and 206 and/or the one or more antennas 108 and 208 of FIG. 21 .
  • the control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140 and controls overall operation of the wireless devices.
  • the control unit 120 may control an electric/mechanical operation of the wireless device based on programs/code/commands/information stored in the memory unit 130.
  • the control unit 120 may transmit the information stored in the memory unit 130 to the exterior (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface or store, in the memory unit 130, information received through the wireless/wired interface from the exterior (e.g., other communication devices) via the communication unit 110.
  • the additional components 140 may be variously configured according to types of wireless devices.
  • the additional components 140 may include at least one of a power unit/battery, input/output (I/O) unit, a driving unit, and a computing unit.
  • the wireless device may be implemented in the form of, without being limited to, the robot (100a of FIG. 20 ), the vehicles (100b-1 and 100b-2 of FIG. 20 ), the XR device (100c of FIG. 20 ), the hand-held device (100d of FIG. 20 ), the home appliance (100e of FIG. 20 ), the IoT device (100f of FIG.
  • the wireless device may be used in a mobile or fixed place according to a use-example/service.
  • the entirety of the various elements, components, units/portions, and/or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 may be connected by wire and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected through the communication unit 110.
  • Each element, component, unit/portion, and/or module within the wireless devices 100 and 200 may further include one or more elements.
  • the control unit 120 may be configured by a set of one or more processors.
  • control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphical processing unit, and a memory control processor.
  • memory 130 may be configured by a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory, a volatile memory, a non-volatile memory, and/or a combination thereof.
  • RAM Random Access Memory
  • DRAM Dynamic RAM
  • ROM Read Only Memory
  • flash memory a volatile memory
  • non-volatile memory and/or a combination thereof.
  • FIG. 24 illustrates a hand-held device applied to the present disclosure.
  • the hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), or a portable computer (e.g., a notebook).
  • the hand-held device may be referred to as a mobile station (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).
  • MS mobile station
  • UT user terminal
  • MSS Mobile Subscriber Station
  • SS Subscriber Station
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • a hand-held device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an I/O unit 140c.
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • Blocks 110 to 130/140a to 140c correspond to the blocks 110 to 130/140 of FIG. 23 , respectively.
  • the communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from other wireless devices or BSs.
  • the control unit 120 may perform various operations by controlling constituent elements of the hand-held device 100.
  • the control unit 120 may include an Application Processor (AP).
  • the memory unit 130 may store data/parameters/programs/code/commands needed to drive the hand-held device 100.
  • the memory unit 130 may store input/output data/information.
  • the power supply unit 140a may supply power to the hand-held device 100 and include a wired/wireless charging circuit, a battery, etc.
  • the interface unit 140b may support connection of the hand-held device 100 to other external devices.
  • the interface unit 140b may include various ports (e.g., an audio I/O port and a video I/O port) for connection with external devices.
  • the I/O unit 140c may input or output video information/signals, audio information/signals, data, and/or information input by a user.
  • the I/O unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.
  • the I/O unit 140c may acquire information/signals (e.g., touch, text, voice, images, or video) input by a user and the acquired information/signals may be stored in the memory unit 130.
  • the communication unit 110 may convert the information/signals stored in the memory into radio signals and transmit the converted radio signals to other wireless devices directly or to a BS.
  • the communication unit 110 may receive radio signals from other wireless devices or the BS and then restore the received radio signals into original information/signals.
  • the restored information/signals may be stored in the memory unit 130 and may be output as various types (e.g., text, voice, images, video, or haptic) through the I/O unit 140c.
  • the wireless communication technology implemented in the device ( FIGS. 20 to 24 ) of the present disclosure may include LTE, NR, and 6G as well as Narrowband Internet of Things (NB-IoT) for low-power communication.
  • NB-IoT Narrowband Internet of Things
  • the NB-IoT technology may be an example of a LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat NB1 and/or LTE Cat NB2, and is not limited to the above-described name.
  • the wireless communication technology implemented in the device ( FIGS. 20 to 24 ) of the present disclosure may perform communication based on the LTE-M technology.
  • the LTE-M technology may be an example of LPWAN technology, and may be called by various names such as enhanced machine type communication (eMTC).
  • eMTC enhanced machine type communication
  • LTE-M technology may be implemented in at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL(non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M, and is not limited to the above-described name.
  • the wireless communication technology implemented in the device ( FIGS. 20 to 24 ) of the present disclosure may include at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) in consideration of low power communication, and is not limited to the above-described name.
  • the ZigBee technology may generate PAN (personal area networks) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and may be called by various names.
  • the embodiments of the present disclosure may be achieved by various means, for example, hardware, firmware, software, or a combination thereof.
  • the methods according to the embodiments of the present disclosure may be achieved by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.
  • ASICs Application Specific Integrated Circuits
  • DSPs Digital Signal Processors
  • DSPDs Digital Signal Processing Devices
  • PLDs Programmable Logic Devices
  • FPGAs Field Programmable Gate Arrays
  • processors controllers, microcontrollers, microprocessors, etc.
  • the embodiments of the present disclosure may be implemented in the form of a module, a procedure, a function, etc.
  • software code may be stored in a memory unit and executed by a processor.
  • the memories may be located at the interior or exterior of the processors and may transmit data to and receive data from the processors via various known means.
EP22784967.6A 2021-04-06 2022-04-06 Procédé et dispositif de positionnement dans un système de communication sans fil Pending EP4322636A1 (fr)

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WO2016032265A1 (fr) * 2014-08-29 2016-03-03 엘지전자 주식회사 Procédé et équipement d'utilisateur permettant d'effectuer une mesure pour prendre en charge le positionnement, procédé et serveur de positionnement permettant de prendre en charge le positionnement et station de base permettant de prendre en charge le positionnement
CN107113569B9 (zh) * 2015-01-26 2021-06-04 苹果公司 提高水平和垂直定位准确性的设备和方法
US11320511B2 (en) * 2017-09-29 2022-05-03 Futurewei Technologies, Inc. Observed time difference of arrival (OTDOA) positioning in wireless communication networks
KR102307426B1 (ko) * 2018-01-19 2021-09-29 차이나 아카데미 오브 텔레커뮤니케이션즈 테크놀로지 포지셔닝 방법 및 관련 기기

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